"There was a problem connecting to server..." message

Hey team.

Ever since changing over to a Mac Studio in the summer, I've been getting a regular error message of "There was a problem connecting to server GiantBrain" whenever I have my phone connected/charging/syncing etc. Now "GiantBrain" was my previous desktop, and my phone syncs perfectly fine with the new one, so why does my new desktop want to connect to my old no longer existing desktop when my phone is attached? Aside from having to dismiss the error, there is nothing else going on, but any ideas of what file or preference I need to delete or update to get rid of this? Is it something related to my iCloud account that still thinks that old desktop is around? (it still shows up in my apple profile as one of my devices)

Thanks in advance.