Slate AX as wireguard client not connecting to Flint 2 Wireguard Server

Technical Support for Routers
1

I have a Wireguard server running on a Flint 2. It's running on port 51821 and the port is open on the primary ISP router. I've verified this becuase I can connect to the server using the Wireguard app on my iPhone. For some reason, I can't do the same from my Slate AX. The connection just hangs. I've created a separate profile for the iPhone and Router respectively so that they can connect simultaneously and have different IP addresses. They're both running the latest firmware. Any clue as to why the Slate AX specifically can't seem to connect. I'm assuming it must be some local configuration or setting that I have that's interfering. The weird part is, this was all working yesterday. I restarted the VPN Server remotely, and the router never connected again

2

I guess both of your router use 192.168.8.x - this isn't allowed.

Change one router to 192.168.10.x for example.
See How to troubleshoot WireGuard

3

I changed that on the router running the vpn client and unfortunately see the same behavior

4

Did you check the link How to troubleshoot WireGuard and all other reasons there?