devotee (in)compatible signature

Lionel Élie Mamane <[email protected]>
Newsgroups gmane.linux.debian.devel.vote
Message-ID <[email protected]> 
How do I generate a signature that is accepted devotee, which is maybe
running an older version of GnuPG, with GnuPG 2.4.7? In particular,
can I use an ed448 signature?

The error message in devotee's answer is:

gpg: WARNING: unsafe permissions on homedir '/srv/vote.debian.org/data/gr_llm'
gpg: packet(2) with unknown version 5
gpg: no signature found
gpg: the signature could not be verified.
[GNUPG:] NODATA 3[GNUPG:] NODATA 4
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