Can not change database issue

Hi

I have moved SEP Manager database to a new server. When I then use Management Server Configuration Wizard to change database
and try to save I get this error:

The management server "sepserver" already exists. You must change the server name.

And my new database server is not saved.

Of course the management server exists, it is only the database address that should be saved.

How can I resolve this issue?

Windows 2012 R2
SQL 2014
SEPM: 12.1.6608.6300