[ChartsNGraffs]

If you need to implement your own OIDC/OAuth I highly recommend Identity Server 4[1]. I've used it in production and it was fairly painless to get up going. It's .NET based & battle-tested. It has lots of samples on GitHub to show you how to get going for the various flows (which they even walk you through in their docs) and has a quickstart UI so you've got something you can brand quickly to give users a contiguous login experience. However, if you can manage not to host your own (don't want to mess with it), I recommend either Auth0[2] or the one of the AWS/Azure solutions mentioned elsewhere.

[1]https://github.com/IdentityServer/IdentityServer4 [2]https://auth0.com/