After changing the Application Identity to a new account and password, the Notification Server, some other Task Servers, and many clients were not able to register to a Task Server.
Error type: HTTP error
Error code: HTTP status 401: The request requires user authentication (0x8FA10191)
Error note: Authentication failed, server refused to authenticate with the provided credentials or the user account is locked
Release: 8.x
The Agent Connectivity Credential in the Notification Server communications profile was configured to use the old Application Identity account and password.
Disabled the override of the Global Agent Settings policy > Authentication tab.