Reason for Authorization error

[Safetynet Devs]

Hello Team,

We faced the below error while making a Google Ads API for one of the Google Ads account, though it is working fine when it runs again after some time:

"error":

{"technicalMessage":"com.google.ads.googleads.v10.errors.GoogleAdsException: errors {
  error_code {
    authorization_error: AUTHORIZATION_ERROR
  }
  message: "Authorization of the client failed."
}
request_id: "<request_id>",     

 "exceptionCategory":"GENERIC"   }

Could you please provide the reason for the cause for this error and the relevant solution.

Thanks