LTI Deep Link - "Oops, something went wrong. The OAuth validation failed."

Blog Post created by mkauffman on May 31, 2019

Quite the problem is  mis-matched time on the Learn server and the tool provider. So first, make certain both servers are running some means of syncing to a time server, ex: ntpd. Second, from a case that I needed help from our OAuth expert with, make certain that the code that calculates the OAuth signature includes everything, including the port. Example: If the Learn server is available on then the OAuth signature calculation for the LTI launch must include the 8443 portion of the URL. 


May all your LTI launches be successful!