Azure B2C integration using PKCE with Grafana Cloud

HI team

I am wanting to get Generic OAuth going with Azure B2C. From the Azure logs I can see that the token exchange is happening after the authentication with Azure B2C. However, with Grafana I am getting a very vague “Internal error” message on the UI

I am using the Cloud offering so I have no idea where I can look at application logs for Grafana to help figure out where things are going wrong