Could you provide us with some more context / steps to reproduce etc so we can have as many details to debug as possible also any screenshots and info when exactly this error code appears would be really appreciated!
I found out the error to be client_id messed up between provider and Auth0.
What I suggest is making tutorials clearer and more detailed. After I decided to study authentication over the weekend it became apparently clear, but it isn’t for one longing for a painless, quick integration. Just a suggestion.