Over the weekend we began having authentication issues on our Auth0 Native application. This solution has been working for several years, so something has changed, but we haven’t been able to put our finger on it.
We are using an older version of the Auth0Client.cs C# library to integrate Auth0 into our application. When we attempt to call GetDelegateToken, we get an invalid_refresh_token failure with an HTTP 401 error. I should add that the Login code path works fine and will return what looks like a valid refresh token. However, using that refresh token does not appear to work correctly.
Is there someone that could help us with where to look for what may have changed?