Getting error in deep link flow while using public jwk url

[preetig]

Launch is working fine, deep link launch is working. Also, able to create assignment. But, getting error in returning to canvas after creating the assignment.

{"errors":{"jwt":[{"attribute":"jwt","type":"JSON::JWK::Set::KidNotFound","message":"JSON::JWK::Set::KidNotFound"},{"attribute":"jwt","type":"JWT verification failure","message":"JWT verification failure"}]}}

Error in this api. Getting 400 Bad Request

https://benchmarkeducation.instructure.com/courses/1412/deep_linking_response?data={some_token}