no signing domain match

From: W <wjlz_at_yahoo.com>
Date: Fri, 5 Jul 2019 03:00:44 +0000 (UTC)

Hi,
I am trying to use opendkim for postfix on ubuntu 18.04 get errors blow.The error ' no signing domain match for' is for a full qualified domain name, not plain domain name. It that correct?
How to debug?Any information would be appreciated. Thanks in advance.
>>>>>>>>>>>>>>>>>>>> Jul  5 02:49:33 server1 postfix/pickup[19370]: 3BD5AE0DFE: uid=1000 from=<choreer_at_server1.mycompany.net>
Jul  5 02:49:33 server1 postfix/cleanup[19393]: 3BD5AE0DFE: message-id=<20190705024933.3BD5AE0DFE_at_mycompany.net>
Jul  5 02:49:33 server1 opendkim[19380]: 3BD5AE0DFE: no signing domain match for 'server1.mycompany.net'
Jul  5 02:49:33 server1 opendkim[19380]: 3BD5AE0DFE: no signing subdomain match for 'server1.mycompany.net'
Jul  5 02:49:33 server1 opendkim[19380]: 3BD5AE0DFE: no signature data
Received on Fri Jul 05 2019 - 03:01:07 PST