is that on patch KB5015814?
if so, the answer I found for that patch refusing to install is a repair install of win 11
This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...
www.elevenforum.com
All it does is replaces windows, everything else stays as it is now.
It takes 20 minutes, longest part is getting the cumulative updates afterwards.
Something broke windows update in June. Lots of people are having problems with the update.