Dear Graham Duffy, I’m Henry and I’d like to share my thoughts on your problem.
I see that you run some command-line to get that machine running again. After a repair like that, it's no wonder some services are out of whack. For the 0x82ac000b sync error seems certainly because the Task Scheduler service got knocked out. Intune is completely dependent on it, so if it's not running, nothing syncs. First we need to fix the Task Scheduler
- Run
sfc /scannowfrom an admin command prompt to fix any corrupted files. - Then, double-check the registry. Go to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Scheduleand make sure the Start value is set to 2 (for Automatic). If it's 4, it's disabled, and that's our culprit. - Try to manually start it with
net start schedule.
If the service starts, try syncing again.
If the Task Scheduler is running but the sync still fails, it means the device's old Intune registration is corrupted. My recommended solution is to completely wipe the stale registration and force the device to re-enroll from scratch.
For the detailed, step-by-step instructions on how to do this safely, you can follow this document
Manually re-enroll a Hybrid Azure AD Join Windows 10 / Windows 11 device to Microsoft Intune.
After this final reboot, try the manual sync again. Hope one of these works for you.