App is live and reviewed but non testers cannot be authenticated

Hey guys,

I haven't been able to get any support from the community so I'm reaching out here.

I am getting an error on fetching long live access tokens. I don't have this issue with testers.

I am both business and tech provider verified.

Endpoint error:

```Status: 400 Error: {"error":{"message":"Unsupported request - method type: get","type":"THApiException","code":100,"fbtrace_id":"AmRXEj0Vy4vTk0rmakGMs3M"}}```

Please help.