Brand New Mac Mini - Activation Lock Hung
My brand new Mac Mini which arrived today was working fine, I set it up with my AppleID, then for no reason it 'Hung' whilst I was processing images. I opened 'Activity Monitor' but that 'Hung' too. I had a 'Spinning Wheel' for about 30 minutes, so my only option was to power it down. It is connected to the Internet by a cable and by WiFi, (from another Mac I can see it in my list of Apple devices - it currently says it is Offline). Upon restart, it went into Activation Lock. It asked for my system password which was fine, then it asked for my AppleID password, which I entered. It then sat with a spinning wheel and would not progress. After around an hour I powered down and restarted, and it is stuck in exactly the same place. Any ideas?
Mac mini, macOS 15.6