gpg says no user ID

[Thomas George]

I am still trying to do a fully verified installation of debian-11.5.0.
gpg --verify SHA512SUMS.sign SHA512SUMS responded with DF98...BE9B

gpg --recv-keys DF98...BE9B responded key DF98...BE9B: new key but 
contains no user ID - skipped.

Another source suggested gpg --key-server keyring.debian.org --recv-keys 
long numeric key

but this responded invalid option --key-server

The gpg man page is beyond me, I need help