Official Sitecore documentation is very minimalistic in many points ;-)
Has someone already implemented an
IdentityServer provider to work with
ADFS (not Azure AD) and OpenID with Sitecore 9.2?
I have only found https://github.com/istern/Sitecore.IdentityServer.ADFS for 9.1 - but looks like there have been a couple of changes since 9.1?