I know Microsoft provides a Google-specific OIDC package (Microsoft.AspNetCore.Authentication.Google) which takes an option in .AddGoogle() to specify AccessType that can be set to offline.
I’ve gone through plenty of Google documentation and SO Q/A’s but with no luck. I wonder if anyone has yet succesfully used the OpenId to OpenId Connect migration as advised by Google.
Usually using the Google OpenId works fine, thousands of times a day, then it will start intermittently going wrong and timing out for an hours or so (some requests will validate but not all). Repeated validation will eventually work.