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OAuth Validation Failed on LTI return

Question asked by ac0048155 on Apr 26, 2019

Hello - we've just recently upgraded our DVM from 3400 to 3500, following the guide posted at Upgrade Your DVM


Our LTI integration is throwing an error - "Oops, something went wrong.  The OAuth validation failed." upon the return POST from our application.  I cannot find any decisive information in the logs to indicate what of the Oauth handshake has failed. 


Of note, the reason we upgraded was to accept the bugfix as described in LTI Deep Linking/Content Item Message



Any suggestions on where to begin troubleshooting Oauth2 from the BBLearn application?