diff --git a/README.md b/README.md
index 61dbf6b4f..b92d0f794 100644
--- a/README.md
+++ b/README.md
@@ -276,7 +276,7 @@ For other information, you can contact the project's [Discord channel](https://d
 
 ## Postman
 
-### AYS Local Collections
+### AYS Local Environments
 
 https://fromsmash.com/sX28.CH0NF-dt
 
diff --git a/src/main/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntity.java b/src/main/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntity.java
index 1e0e1aac9..bfa98f0ab 100644
--- a/src/main/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntity.java
+++ b/src/main/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntity.java
@@ -39,6 +39,10 @@ public class AdminUserRegisterVerificationEntity extends BaseEntity {
     @JoinColumn(name = "ADMIN_USER_ID", referencedColumnName = "ID", insertable = false, updatable = false)
     private AdminUserEntity adminUser;
 
+    public boolean isWaiting(){
+        return AdminUserRegisterVerificationStatus.WAITING.equals(this.status);
+    }
+
     public void complete(final String adminUserId) {
         this.adminUserId = adminUserId;
         this.status = AdminUserRegisterVerificationStatus.COMPLETED;
diff --git a/src/main/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImpl.java b/src/main/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImpl.java
index dbec18a89..ce20b4714 100644
--- a/src/main/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImpl.java
+++ b/src/main/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImpl.java
@@ -63,6 +63,7 @@ public void register(final AdminUserRegisterRequest registerRequest) {
 
         final AdminUserRegisterVerificationEntity verificationEntity = adminUserRegisterVerificationRepository
                 .findById(registerRequest.getVerificationId())
+                .filter(AdminUserRegisterVerificationEntity::isWaiting)
                 .orElseThrow(() -> new AysAdminUserRegisterVerificationCodeNotValidException(registerRequest.getVerificationId()));
 
         if (!institutionRepository.existsById(registerRequest.getInstitutionId())) {
diff --git a/src/test/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntityBuilder.java b/src/test/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntityBuilder.java
index eb4c88dff..649441778 100644
--- a/src/test/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntityBuilder.java
+++ b/src/test/java/com/ays/admin_user/model/entity/AdminUserRegisterVerificationEntityBuilder.java
@@ -1,5 +1,6 @@
 package com.ays.admin_user.model.entity;
 
+import com.ays.admin_user.model.enums.AdminUserRegisterVerificationStatus;
 import com.ays.common.model.TestDataBuilder;
 
 public class AdminUserRegisterVerificationEntityBuilder extends TestDataBuilder<AdminUserRegisterVerificationEntity> {
@@ -8,4 +9,13 @@ public AdminUserRegisterVerificationEntityBuilder() {
         super(AdminUserRegisterVerificationEntity.class);
     }
 
+    public AdminUserRegisterVerificationEntityBuilder withValidFields() {
+        return this
+                .withStatus(AdminUserRegisterVerificationStatus.WAITING);
+    }
+
+    public AdminUserRegisterVerificationEntityBuilder withStatus(AdminUserRegisterVerificationStatus status){
+        data.setStatus(status);
+        return this;
+    }
 }
diff --git a/src/test/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImplTest.java b/src/test/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImplTest.java
index ff71d4768..0725794c9 100644
--- a/src/test/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImplTest.java
+++ b/src/test/java/com/ays/admin_user/service/impl/AdminUserRegisterServiceImplTest.java
@@ -7,6 +7,7 @@
 import com.ays.admin_user.model.entity.AdminUserEntityBuilder;
 import com.ays.admin_user.model.entity.AdminUserRegisterVerificationEntity;
 import com.ays.admin_user.model.entity.AdminUserRegisterVerificationEntityBuilder;
+import com.ays.admin_user.model.enums.AdminUserRegisterVerificationStatus;
 import com.ays.admin_user.repository.AdminUserRegisterVerificationRepository;
 import com.ays.admin_user.repository.AdminUserRepository;
 import com.ays.admin_user.util.exception.AysAdminUserAlreadyExistsByEmailException;
@@ -56,10 +57,14 @@ void givenValidAdminUserRegisterRequest_thenAdminUserRegistered() {
                 .withEmail(AysTestData.VALID_EMAIL)
                 .withPhoneNumber(mockPhoneNumber).build();
 
+
+
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
         // When
-        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder().build();
         Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
-                .thenReturn(Optional.ofNullable(mockAdminUserRegisterVerificationEntity));
+                .thenReturn(Optional.of(mockAdminUserRegisterVerificationEntity));
 
         Mockito.when(institutionRepository.existsById(Mockito.anyString()))
                 .thenReturn(true);
@@ -83,12 +88,13 @@ void givenValidAdminUserRegisterRequest_thenAdminUserRegistered() {
         Mockito.when(adminUserRepository.save(Mockito.any(AdminUserEntity.class)))
                 .thenReturn(mockAdminUserEntityToBeSaved);
 
-        assert mockAdminUserRegisterVerificationEntity != null;
-        mockAdminUserRegisterVerificationEntity.complete(mockAdminUserEntityToBeSaved.getId());
-        Mockito.when(adminUserRegisterVerificationRepository.save(
-                        Mockito.any(AdminUserRegisterVerificationEntity.class))
-                )
-                .thenReturn(mockAdminUserRegisterVerificationEntity);
+        AdminUserRegisterVerificationEntity mockCompletedVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
+        mockCompletedVerificationEntity.complete(mockAdminUserEntityToBeSaved.getId());
+        Mockito.when(adminUserRegisterVerificationRepository
+                        .save(Mockito.any(AdminUserRegisterVerificationEntity.class)))
+                .thenReturn(mockCompletedVerificationEntity);
 
         // Then
         adminUserRegisterService.register(mockAdminUserRegisterRequest);
@@ -130,6 +136,35 @@ void givenInvalidVerificationIdFromAdminUserRegisterRequest_whenVerificationEnti
                 .findById(Mockito.anyString());
     }
 
+    @Test
+    void givenUsedVerificationIdFromAdminUserRegisterRequest_whenVerificationEntityStatusIsWaiting_thenThrowAysAdminUserRegisterVerificationCodeNotValidException() {
+
+        // Given
+        AysPhoneNumber mockPhoneNumber = new AysPhoneNumberBuilder().withValidFields().build();
+        AdminUserRegisterRequest mockAdminUserRegisterRequest = new AdminUserRegisterRequestBuilder()
+                .withVerificationId(AysRandomUtil.generateUUID())
+                .withInstitutionId(AysRandomUtil.generateUUID())
+                .withEmail(AysTestData.VALID_EMAIL)
+                .withPhoneNumber(mockPhoneNumber).build();
+
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity =
+                new AdminUserRegisterVerificationEntityBuilder()
+                        .withStatus(AdminUserRegisterVerificationStatus.COMPLETED)
+                        .build();
+        // When
+        Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
+                .thenReturn(Optional.of(mockAdminUserRegisterVerificationEntity));
+
+        // Then
+        Assertions.assertThrows(
+                AysAdminUserRegisterVerificationCodeNotValidException.class,
+                () -> adminUserRegisterService.register(mockAdminUserRegisterRequest)
+        );
+
+        Mockito.verify(adminUserRegisterVerificationRepository, Mockito.times(1))
+                .findById(Mockito.anyString());
+    }
+
     @Test
     void givenInvalidInstitutionIdFromAdminUserRegisterRequest_whenInstitutionNotExist_thenThrowAysInstitutionNotExistException() {
 
@@ -138,8 +173,10 @@ void givenInvalidInstitutionIdFromAdminUserRegisterRequest_whenInstitutionNotExi
                 .withVerificationId(AysRandomUtil.generateUUID())
                 .withInstitutionId("Invalid").build();
 
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
         // When
-        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder().build();
         Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
                 .thenReturn(Optional.ofNullable(mockAdminUserRegisterVerificationEntity));
 
@@ -167,8 +204,10 @@ void givenExistingEmailFromAdminUserRegisterRequest_whenAdminUserExist_thenThrow
                 .withInstitutionId(AysRandomUtil.generateUUID())
                 .withEmail(AysTestData.VALID_EMAIL).build();
 
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
         // When
-        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder().build();
         Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
                 .thenReturn(Optional.ofNullable(mockAdminUserRegisterVerificationEntity));
 
@@ -201,8 +240,10 @@ void givenExistingUsernameFromAdminUserRegisterRequest_whenAdminUserExist_thenTh
                 .withInstitutionId(AysRandomUtil.generateUUID())
                 .withEmail(AysTestData.VALID_EMAIL).build();
 
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
         // When
-        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder().build();
         Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
                 .thenReturn(Optional.ofNullable(mockAdminUserRegisterVerificationEntity));
 
@@ -242,8 +283,10 @@ void givenExistingPhoneNumberFromAdminUserRegisterRequest_whenAdminUserExist_the
                 .withEmail(AysTestData.VALID_EMAIL)
                 .withPhoneNumber(mockPhoneNumber).build();
 
+        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder()
+                .withValidFields()
+                .build();
         // When
-        AdminUserRegisterVerificationEntity mockAdminUserRegisterVerificationEntity = new AdminUserRegisterVerificationEntityBuilder().build();
         Mockito.when(adminUserRegisterVerificationRepository.findById(Mockito.anyString()))
                 .thenReturn(Optional.ofNullable(mockAdminUserRegisterVerificationEntity));