My iphone and mac still "connect" to a wifi netowrk that no longer exists
Very bizarre issue here.
I had a problem with a router and AT&T sent me a new one. It's connected but not to the internet. There are more issues.
The old router, with an older ID and password is boxed up to be sent back to AT&T. The old network name still shows up and both my phone and computer claim to be connected to it.
iMac 27″ 5K, macOS 12.6