Keeps saying configuration file not found

[Vansen111]

Hi, I have a problem using the tokenizer. I insert the source file and the configuration source filename having a valid json. I use the tokenizer in the build pipeline.
On build it keeps saying the configuration file cannot be found. It is checked in and has a valid json inside of it. Contents are as follows - to avoid mistakes that might be caused by underscores I put in both possibilities:
{
"Default Environment": {
"CustomVariables": {
"app.root.url": "https://abc.123..com",
"app_root_url": "https://abc.123.com"
}
}
}

Anyone can help me out?
Thx

[pcleckler]

We use a workaround. If the path to the configuration JSON is fully qualified, the problem no longer happens.