Hi Team,

We are trying to implement LTI 1.3 Advantage (Deep Linking) in our tool, we are able to generate JWT token and while sending that token to the Canvas server we are getting below error.

{"errors":{"jwt":[{"attribute":"jwt","type":"JWT format is invalid","message":"JWT format is invalid"}]}}

We have verified the response JWT, which is per the LTI standard. Attached is the same below.

Header (The kid is matched with my inserted jwks kid)

{
  "alg": "RS256",
  "kid": "RV6OzALomjinkCIWc9QXYnRBxJw0jzWcdf6a8M05Mye6RaPqilZI81ptDsWLc90q",
  "typ": "JWT"
}

Payload

{
  "https://purl.imsglobal.org/spec/lti/claim/message_type": "LtiDeepLinkingResponse",
  "https://purl.imsglobal.org/spec/lti/claim/version": "1.3.0",
  "iss": "<canvas-client-id>",
  "aud": "https://canvas.instructure.com",
  "exp": "1674118953",
  "iat": "1674118653",
  "nonce": "HeP1fUhtbus",
  "azp": "EptPvHHKXr0",
  "https://purl.imsglobal.org/spec/lti/claim/deployment_id": "11796:896746821c480c1601d9f9521a6f454e8cb7625a",
  "https://purl.imsglobal.org/spec/lti-dl/claim/content_items": [
    {
      "text": "Diffusion Description",
      "title": "Diffusion",
      "type": "ltiResourceLink",
      "url": "https://my-url.cloudfront.net/nurl/index.html"
    }
  ]
}

Can anyone please help me with the resolution?