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AGS access token is invalid

An LTI 1.3 tool I'm working on posts grades to Canvas through the LTI grading service. For most institutions this works just fine, but two of them are getting this error: Invalid access token field/s: the 'aud' is invalid. I've confirmed that the audience claim matches what is in the Canvas LTI docs. I have other institutions using canvas who's access tokens look similar and they aren't having any issues. Any ideas what is going on?

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