HTTP Error 400 when trying to load external tool in a new window for an assignment
I have recently integrated my third-party app into my instance of Canvas via LTI setup. I have a paying customer school that used my app and am recreating the same setup in my instance as in theirs but am receiving an HTTP 400 error when the button is clicked on in the assignment.
Initially, it looked like the domain was not whitelisted as it was blocked by the school's admin, but they say we were added to the whitelist. However, we are still getting the same 400 error.