We are working on LTI 1.3 implementation. We have deep-linking working and now trying to implement score service. However, we keep getting 500 (Internal Server Error) from the token service. We have followed steps outlined here
OAuth2 Endpoints - Canvas LMS REST API Documentation.
We are generating a token request via a POST /login/oauth2/token with a grant_type of client_credentials and a properly formed JWT signed with our private key. The Scope is https://purl.imsglobal.org/spec/lti-ags/scope/score
Here is a sample Score json.
We are able to get the tokens from other platforms. Is there anything we should be doing to get a valid token back?