Physically moved desktop from one room to another. Now I'm asked to "authorize my new device." Why?

Standard DHCP lease time on a LAN is a week in my experience. VPNs will often be shorter, 1 day seems about right.

In your other post, you said “requiring me to redo a number of security steps that I had just done before”

Well, that’s the point of DHCP servers.

you didn’t mention VPN before, so that’s why your IP address changes that often. That makes sense.