DKIM Record Not Working

I was setup SPF, DKIM and DMARC Record for my mail server,
SPF and DMARC Record are working normally now,
But i got a problem for my DKIM Record,
When i do: dig default._domainkey.example.com txt
The DKIM Record is published, i got a return from dig like v=DKIM1; h=sha256; k=rsa;p="HASH"
But when i check it from mail-tester.com, i got You're not fully authenticated, Your message is not signed with DKIM
It's already been 24hours and i think my DKIM Record already propagated.What should i do for this DKIM Record?

"Your message is not signed with DKIM" - means that your messages is not signed.

You have the record published, but your email-server does not sign the emails.