Mail signatures not syncing from desktop to laptop

This is a pretty common Apple Mail iCloud sync issue. Even if signatures appear in All Signatures, they won’t work unless they’re correctly linked to the specific mail account, and iCloud sometimes removes them after restart.

A few things that usually help:

• Make sure both Macs are signed into the same Apple ID and iCloud Mail is enabled
• Quit Mail on both devices → re-enable Mail sync in iCloud → reopen Mail
• Try creating one new test signature directly on the laptop and assign it to the account, then check if sync starts working

If you need the same signature across multiple devices reliably, some people generate the signature externally (for example with MySignature) and just paste it into each device, it avoids iCloud sync issues completely.