How to authorize a server app platform app as I am only admin and it's a trial account

I am trying to run self hosted mcp server using CCG but to get tokens I need a server authentication app to run it on an azure web app as a container. My account is on box free trial.

Issue-

1. I can’t authorize the platform app as server authentication.
2. Would be also interested to know what solution other people came up with to get pass this obstacle.