Recently tried to install Edge on OpenSuse, but this is the problem. It will come again, when an update to happen.
microsoft-edge-dev-89.0.731.0-1.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID be1229cf: NOKEY
The same problem with Kubuntu too, no gpg signed key. The key cannot be added, for it is not signed.
We usually ignore the matter, but it would be nice, if the devs would find a solution.