For some years, I have been running a client server configuration of MC. The server has been on my Windows 10 HTPC (an Intel NUC), while the client is on my primary Windows 10 workstation. I can't now remember why I did it that way around, but it has not proved to be the most convenient arrangement.
My primary workstation is much easier for me to use for MC admin tasks, so I access the HTPC remotely using VNC. That works well enough but gives me a lower resolution image, so I don't see as much detail as I see on the local instance of MC. Viewing videos remotely is also less than satisfactory, due to slow and jerky playback.
It recently occurred to me that reversing this client server configuration might be a better arrangement, so I restored a recent library backup from the HTPC to MC on my primary workstation and then renamed the library. That went well, so I then tried to use the Add Library process on the HTPC to add a link to my new Library Server but it didn't accept the Access Key. I then found that the restoration process on the workstation had overwritten the previous Access Key with the key used on my HTPC.
Both my MC installations now have the same Access Key. If I try using that key I am warned that "You can't add your own library. Please enter the key of a different library". How do I get out of this mess?
Note that I'm using MC 27 on my workstation and MC 26 on my HTPC.