I am prompted for this address in a dialogue box when starting the set-up on my new Mac mini M4 Pro on the same network as the older Mac mini. I am asked do I want to import settings etc from a Mac, TimeMachine backup, etc. I select "Mac" and then dialogue box appears with <CANCEL> and <CONTINUE> buttons. There are no prompts, either pop-up or drop-down, to select from a range of options, it expects me to know the address in the format given.