unable to fetch outlook Calendar

Certified Lead Developer

Am able to get the token generation, after registering the application on azure platform, with the help of client secret and client id and Application tentant Id, but now, when  am trying to read calendar, am not able to as it says 

"error": {
        "code""BadRequest",
        "message""/me request is only valid with delegated authentication flow.",
        "innerError": {
            "date""2023-07-21T12:12:46",
Please let me know, what can be there issue here.
and also when am trying to enter my organization email address instead of me in URL, still getting the below error:
 "error": {
        "code""BadRequest",
        "message""Resource not found for the segment  ********@****.com

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