Code runs fine locally in debug and release mode. Deployed to an S1 or B1 App Service it also runs fine. Recently, without any code changes, my D1 App Service stopped working out of the blue. When I try to access the site, I get a 502.5 ANCM Out-Of-Process Startup Failure.
So I enabled stdout and got the following log...
System.InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.IUserStore\`1[XXXXX.Domain.Authentication.ApplicationUser]' while attempting to activate 'Microsoft.AspNetCore.Identity.UserManager\`1[XXXXX.Domain.Authentication.ApplicationUser]'.
Like I said, nothing changed with the code or my Azure App Service in the past 2 months, however, this started happening two days ago. Why would I just now start receiving this error and why does it work on an S1? Also, I've looked at metrics and my quotas are nowhere close to being hit. The site has an average of between 2-8 users a day.