1. Make sure that the client has the proper WSUS settings
2. Make sure that the agent services are up and running
3. Make sure the WSUS server is reachable from the client
4. Make sure the agent is healthy and working
5. Automatic Update Agent Store is corrupted
6. Clients with the Same SUSclient ID
7. Conflicts with System Center Configuration Manager
New Windows clients connect to the WSUS host using the Windows Update client and ask if any changes apply to them. If so, the Windows Update policy takes over. Now that you say this, is the PC object part of the wsus group that approves changes, either directly or by inheritance?
I’ve seen cases where the machine being imaged was registered with WSUS because the machine being imaged was already trusted by WSUS. What happened next was that multiple clients tried to register with WSUS using the same SUSClientID.
Check HKEYLM\Software\Policies\Microsoft\Windows\Windows Update\ and WUSer with point WuStatusServer for the correct server:port. Removing/adding computers in DNS.
Is the WSUS endpoint still providing status reports to WSUS?
Endpoints continue to provide state information to WSUS. The behavior persists across reboots, deleting the software distribution file, and uninstalling/reinstalling the last few months of Win10 Cumulative Updates. All PCs with the Creator update will work safely for several months.
How to synchronize WSUS to another WSUS server?
If families choose to sync from a different WSUS server, provide the server name in addition to the port that the server type uses to communicate with the upstream host. To use Select SSL, select the Use SSL when synchronizing update information check box. Whether servers will use slot 443 for synchronization.
How do I check my WSUS client status?
Run wuauclt /reportnow to update WSUS based on the state of the computer, then run wuauclt /detectnow up to check for updates.

Ermias is a tech writer with a passion for helping people solve Windows problems. He loves to write and share his knowledge with others in the hope that they can benefit from it. He’s been writing about technology and software since he was in college, and has been an avid Microsoft fan ever since he first used Windows 95.