SQL Server principal has one or more endpoints that cannot be deleted; Error 15141

First, the problem description

The current DB instance has been joined to a domain environment and is also a replica of an AlwaysOn cluster, and has now exited the previous domain to join a new domain, and the configured database starts the service with the same domain user and password as before. Re-using a previously existing domain user login database prompts that the user name does not exist, and that the user cannot delete the hint that an endpoint already exists, and finds that the endpoint was generated when AlwaysOn was created.

Second, problem-handling

 Use [master] GO /* * * * Object:  Endpoint [Hadr_endpoint]    Script DATE:2017/9/20 17:52:01 * * */DROP[  Hadr_endpoint]GO

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SQL Server principal has one or more endpoints that cannot be deleted; Error 15141