Event ID 124 after dbx update

I successfully activated the recent dbx update from Microsoft, dated May 9. ( I checked that I got Event ID 1035: "Secure Boot DBX update applied successfully.")

Now, my computer gets an error at every boot:

Event ID: 124
Source: Kernel-Boot
"The virtualization-based security enablement policy check at phase 6 failed with status: Unknown NTSTATUS Error code: 0xc000ffff"

I did not get this error with any previous dbx revocation list updates.

I have Googled this and have found no solution. Does anyone have an idea what this error message means and how to fix it?

My computer runs Windows 11 Pro, Version 22H2 (OS Build 22621.1778)

Thanks!