'Canvas LTI launch gives Unrecognized token \'iss\'

New to canvas LTI.

Trying to implement a basic launch to see what data parameters LMS(canvas) will be send to my endpoint.

Before that:

  1. Created a Developer Key from canvas. Noted the client ID

  2. Went to settings -> apps -> add app -> by client ID and used the ID from step 1.

  3. Went to a course -> add a module -> Add item to module(external tool) selected my app created in step 2.

Click on the App link(launch) and gets the following error:

{"message": "Could not parse request body into json: Could not parse payload into json: Unrecognized token \'iss\': was expecting (JSON String, Number, Array, Object or token \'null\', \'true\' or \'false\')\n at [Source: (byte[])\"iss=https%3A%2F%2Fcanvas.instructure.com&login_hint=ce958d31919f77ad0ef5e7e928e5ea087b35944d&client_id=10000000000010&target_link_uri=https%3A%2F%2Fmaster.d1z84s1ajfpa4v.amplifyapp.com&lti_message_hint=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ2ZXJpZmllciI6IjM1NGQ4YWRkMzdmZTBmOWM0NzFlZTc2YTdhOGNmY2ZmYTg3NTdlNDJmMDZmODBjZGU1NDg2YWQ0ZTE2YjE0NjU2NjMxMDU3OThlNzY3YzY1NTg0NTM2MTQ5ZTk5NWM4YjM0NzFmYzg5ZDA3YjU1OWI4MTQ4NDZkOGM5MmQwZjA1IiwiY2FudmFzX2RvbWFpbiI6IjUyLjQ1LjIzOS4yMzQiLCJjb250ZXh0X3R5cGUiOiJDb3Vyc\"[truncated 166 bytes]; line: 1, column: 5]"}

The docs are really not helping me, So here seeking for some help, please correct me If I am wrong or missed any steps.

lticanvas-lms


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