Hi Mark,
0x800F081F = CBS_E_SOURCE_MISSING The source for the package or file not found.
Consider an in place upgrade repair:
https://www.elevenforum.com/t/repair-install-windows-11-with-an-in-place-upgrade.418/
https://www.elevenforum.com/t/repair-install-windows-11-with-an-in-place-upgrade.418/
https://www.microsoft.com/en-us/software-download/windows11?msockid=15ca77c26bb2638a118d621e6a4962d1