Hi, I was able to update with paru, but I doubt that yay is your problem. Have all other packages updated successfully? Perhaps gpg was updated, and you’d need to reboot first. Also, “disconnect and quit” from Mullvad before updating. See if that helps.
Correction: I updated the mullvad-vpn-bin package, which uses a different key. That would be another option, I suppose, but your problem is with verifying keys, not the particular ones.
→ ALWAYS DO A CLEAN BUILD ←
This package will verify the signature of the git tag / commit. Developer keys are available here and instructions are here. See the PKGBUILD to determine which developer key you need.
I tried installing the mullvad-vpn-bin package, it failed. I looked at the mullvad gpg instructions and couldnt really figure it out. I tried again but I clicked N when it asked Import ? y| n and it worked. Thanks for the help @SdW@r0ckhopper .