Hello PatJ_S,
Thank you for posting in Microsoft Community forum.
If the issue occurs on only this one machine?
Based on the information above, you can check something below:
1.Check network connectivity between this domain client and Domain Controller.
for example:
Ping IP of DC and ping domain name and ping FQDN of domain.
Check AD ports that need to be open between Domain client and DC.
2.Check DNS setting on this domain client, if the preferred DNS setting is the IP address of the DNS server (the IP address of the DC server if your DC is also DNS server).
3.Check the GPO name corresponding to {AEA1B4FA-97D1-45F2-A64C-4D69FFFD92C9}.
4.Also, check if AD replication is working fine by running commands below on PDC.
repadmin /showrepl >c:\rep1.txt
repadmin /replsum >c:\rep2.txt
repadmin /showrepl * /csv >c:\repsum.csv
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou