We are planning to perform server rename with the production data copy. When we are accessing QM application we see below error in UI 

{"nestedError":{"errorClass":"com.ibm.team.repository.common.PermissionDeniedException","errorMessage":"Permission Denied","errorCode":null},"errorClass":"java.lang.RuntimeException","errorMessage":"com.ibm.team.repository.common.PermissionDeniedException: Permission Denied","errorCode":500}

Error in QM Log file

ERROR m.team.integration.auth.sdk.AuthenticatorException [TID: 880FBFFC] - CRJSA0008E The application could not authenticate with another application by using a bearer token. This error was returned: "null"
Explanation: The application attempted to contact another application with a bearer token but was unable to authenticate.
User Action: For details about the cause of the error, check the log files for both the sending and the receiving applications.

Any help on the above issue will be much appreciated