Swiftly Can't Find Public Key for Swift 6

When trying to install Swift 6.0 on OpenSUSE Tumbleweed using Swiftly, I get an error from GPG: "gpg: Can't check signature: No public key" Is there something I can do to fix this?

Console Output
❯ swiftly install 6.0
Fetching the latest stable Swift 6.0 release...
Refreshing Swift PGP keys...
Installing Swift 6.0.0
                             Downloading Swift 6.0.0
100% [=============================================================]
Downloaded 773.3 MiB of 773.3 MiB
Downloading toolchain signature...
Verifying toolchain signature...
gpg: Signature made Mon 16 Sep 2024 04:14:14 PM CDT
gpg:                using RSA key EF80A866B47A981F
gpg: Can't check signature: No public key
Error: Toolchain signature verification failed: Error(message: "gpg exited with non-zero status: 2")