Hello @aross150 !
In my time of troubleshooting SIS Errors with I.C. (Infinite Campus) this error you are seeing reminds me of a term we sometimes use called an "Integration ID". This ID I speak of is a special string of numbers and letters that essentially tell I.C. which assignment/quiz/discussion is trying to send grades and then Infinite Campus knows where to send any updates that might be coming for those grades.
Without knowing the full error message this is only speculation, however, we have some information on Error codes that might come up with I.C. that could be beneficial and it talks over what to try if that error code is what you are seeing on the "Grade Sync" tab in the specific course that is trying to send grades.
If you continue to see this error for a specific course it is likely best to get a support case in so our Canvas SIS Team can offer more detailed guidance!
