Error code 0x800f0818 during the Windows 11 23H2 feature update usually points to a missing or corrupted update package or component manifest. Since you've already tried the standard repair steps (resetting Windows Update components, you may need to do this offline.
Additionally,
Review the logs for more specific errors:
-
C:\Windows\Logs\CBS\CBS.log
-
C:\Windows\Logs\DISM\dism.log
Look for lines mentioning missing payloads or failed package installations.