Hi @Emorut Edward ,
Thanks for your posting.
Based on your description, you would like to get an alert when computers are joined or disjoined. According to our experience, there is no such built-in function. We could monitor the events in the event viewer about the computer creation and computer change. Or we could use the powershell script to get all the computer objects.
For more information, we could refer to the below links:
https://www.adaxes.com/questions/915/notify-computers-joined-to-domain
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Best regards
Wesley Li