Cant change Networks

Super frustrated and should not be. I have been running Home Assitant for several years on a Raspberry PI 4 and all was well until I wanted to change the IP address range that my HA is running on. I want to move it from a 192.168.168.X to a 192.168.100.x network. It wont accept any IP address in that range from my router. I can set it manually but then I have no network connectivity at all. Getting it to take any IP in the 192.168.168.X range is not a problem with DHCP or static. What is the trick? I have never had any issue in the past with any other devices…this is a first.

I just set a static IP in the HA settings like so:-

If your router is configured to issue IP addresses in the range you need, and you can’t see HA connected to it, then it might be a few things:-

The IP is already assigned to another device.
You have an address reservation rule in the router for the old IP.

Yes so simple. The problem is I lose all network connectivity and can only restore connectivity by using the CLI interface and setting back to DHCP or static in the current subnet. I want to move to a new subnet but once I do the ehternet connection is no longer useable. Moving from 192.168.168.x to 192.168.100.X

So your are setting your routers address range to the new subnet, then changing the static IP for HA but you can’t get a network connection?

Resolved, had to make some changes in the VLAN configuration on my Ubiquiti AP and a switch the AP was on that was causing my HA server to not be happy on its Ethernet connection. Case of not focusing my attention in the right place. All of the Wifi clients were working just not the server that was hard wired.