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Best way to troubleshoot OIDC IDP callback?

I am integrating with a third-party OIDC IDP. Keep getting 400 with error "You may have pressed the back button, refreshed during login, opened too many login dialogs, or there is some issue with cookies, since we couldn’t find your session. Try logging in again from the application and if the problem persists please contact the administrator. ". The server log doesn’t have much information. What’s the best way to tell which part of OIDC didn’t work? Be it nonce, jwk, signiture verification etc.

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Yep let us know if that’s what @rashid779939 mentioned!