Mullvad VPN Error -7Get Mullvad Address Fail!

I just recently bought Mullvad VPN for my GL - SFT1200 / Opal Router, however whenever I type in my account code it returns this error, -7Get Mullvad Address Fail! Im not sure if its due to some setting I have in my routers Admin Panel. Please help, thanks!

Please check if you are running the latest software version and upgrade if necessary: GL.iNet download center

Check that internet is working as well.

Hello,

Please check the DNS settings, you can change it to Google or Cloudflare DNS.

In the same network source, can the Mullvad client software on the laptop be logged in and connected normally?