Mail signatures not syncing from desktop to laptop

Mail signatures I create on my desktop do not show up on my laptop.

On my desktop: they are in all signatures, iCloud, and on my Mac in Settings. They show up in the signature menu when I create an email.

On my laptop: They are in All Signatures in settings, but not in iCloud or on my Mac. I can drag them to iCloud and on my Mac so it looks like they are there, but they don't show up in the signature menu when I create an email, and when I restart Mail they have disappeared from iCloud and on my Mac again.

I have tried turning off Sync this Mac on both computers, both with Mail running and when quit out of Mail, with no change.

Please tell me how to get these signatures on my laptop.