Cannot remove OTP locking code

[wagner-robert]

Trying to program and remove a access-code. Tried several other examples from here: https://developers.yubico.com/yubikey-personalization/

------------First program the access-code on a slot (NOTE- No access-code on slot 1)
C:\Program Files (x86)\Yubico\bin>ykman otp settings -A 010203040506 2
Update the settings for slot 2? All existing settings will be overwritten. [y/N]: y
Updating settings for slot 2...

------------------Then try and remove it
C:\Program Files (x86)\Yubico\bin>ykpersonalize -2 -c=010203040506 -a00000000000000000000000000000000 -oaccess=000000000000
Firmware version 5.4.2 Touch level 1295 Program sequence 5
Invalid access code string: (null)
USB error: The operation completed successfully.

----------------See if it was successful
C:\Program Files (x86)\Yubico\bin>ykman otp swap
Swap the two slots of the YubiKey? [y/N]: y
Swapping slots...
Error: Failed to write to the YubiKey. Make sure the device does not have restricted access.