I have seen several old articles on this topic in there from years ago. I have been gertting the error " There are no Identity Providers in your account" on all sites that I have configured. I was using a OTP authentication initially and tried configuroing a google authentication Identity Provider as well The test of the Google ID Provider works so I know it is configured.
Did you figure anything out? I set up a new tunnel to a blog that I am self-hosting and I don’t want the one -time pin on it, so I deleted that, but now I just get “There are no Identity Providers in your account” when trying to access.
I fixed it by going into the menu, Zero Trust - Access - Applications and removing the app from there.