Getting GL router MullVad working with 2nd PFSenSe router

I bought The GL for Wireguard use and had high hopes.
I am unsuccessful in getting the GL.Inet Router MUllvad Wireguard working with a PFSenSe 2nd Router. I Have the GL.Inet after the Pfsense using and connecting to the GL Lan. I have full Internet for GL devices by changing there DNS address to 192.168.1.1 WAN of the PFSenSe.
What happens Is, I enter My Mullvad ac number, and then it comes up with the Error -7 Address Fail. It never makes it to the next screen. It’s getting blocked. The MullVad Apple app works on Tablet connecting to the wireless on GL.Inet when it’s behind the PFsense. When Using the GL on its own to the Modem the WireGuard works.

Have You got any solutions?

I would say the pfSense is blocking the connection to the Mullvad seever either by blocking it directly or DNS.

You could use your phone for tethering and then logging into Mullvad. But I am not sure if the VPN will work later because the desktop apps are able to do more „magic“ than the router.

So, I tried Tailscale. The Link to bind the GL router to tailscale gets blocked as well, and same with zero tier. I tried Putting A switch in between the PFSenSe and gl.Inet but makes No difference. Why would the Mullvad Apple app work but not the router one?

Because the app is different, it might not call the API of Mullvad directly.
Or you do have some DNS issue on your router. Check if DNS and ping works fine, see How to get support quickly

I am getting log of
daemon.notice netifd: Interface 'wgclient' is setting up now
daemon.notice netifd: wgclient (10133): RTNETLINK answers: Permission denied

The DNS Is working Ok. I also tried Port Forwarding on 51820. The WG Client is already preconfigured in the Firewall to pass,

Wireguard network is different from any network near your router, yeah?

Yes it is.

PFsense is on 192.168.1.1 and Setup With a PPOE Connection. Both routers have the internet. 2Nd Router is 192.168.1.6
DHCP Disabled on 2Nd router

Tried putting 2nd router into DMZ.

Edit: Realised I Should Have 2nd Router as 192.168.2.1 If DHCP Disabled. Need to test.

Solved, Once The network was Setup properly MullVad WG worked. I Plugged LAN into WAN of router 2. I Had It in LAN and then mistakenly In wan2. I setup A static IP. Advice I been Given is plugin to the LAN by which I had no Internet, unless of course I used the Gateway of Router1.