Youtube Auto Comment Error Code 403

Have followed the setup process. Did some test and got this error code: [29-May-2020 01:19:11 UTC] Exception thrown in YouTube posting: { "error": { "errors": [ { "domain": "youtube.commentThread", "reason": "ineligibleAccount", "message": "The callers YouTube account is not connected to Google+.", "locationType": "header", "location": "Authorization" } ], "code": 403, "message": "The callers YouTube account is not connected to Google+." } } How can I resolve this?