Getting -2147024891, System.UnauthorizedAccessException - Sharepoint Online Rest API

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We are fetching Sharepoint list through REST API for a client (tenant domain is medicaldesigninnovations), for that

  1. We have registered an app here 
  2. Getting access/bearer token here
  3. Passing the bearer token to fetch a list called 'Project List' here'Project List')/items but getting the below error, response status is 403 Forbidden


    "error": {

        "code": "-2147024891, System.UnauthorizedAccessException",

        "message": {

            "lang": "en-US",

            "value": "Attempted to perform an unauthorized operation."




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