Hi there,
This is DNS suffix problem, make sure You have DNS suffixes on the Client systems.
Go to the IP4 Properties - click on advanced button at the bottom which will Advanced TCP/IP settings. GO to Append these DNS suffixes click on add and then Add domain.com there. click ok
It should resolve the problem.
The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
--If the reply is helpful, please Upvote and Accept it as an answer--