Thanks for these instructions.
They helped me fix the error 0x80070643 when installing the KB5034441 security update on 3 different PCs (with winre.wim missing on some, but not on others...).
Judging by the amount of discussion on Microsoft's forum within the last few days, this error appears to be quite frequent (perhaps more common after SSD migration).
I found the instructions above a good complement to Microsoft's own KB article, especially for the case where the recovery environment is missing from your PC:
https://support.microsoft.com/en-us/topic/kb5028997-instructions-to-manually-resize-your-partition-to-install-the-winre-update-400faa27-9343-461c-ada9-24c8229763bf
--mgroeber9110

Thank you for your article.
I did a clean install of Windows 10 LTSC 2019 on my old PC with an old BIOS. I deleted all the disk partitions and I clicked next to start installing Windows. In the end, I only had 2 partitions. The "System Reserved" & the "Partition C:".
Since my system is not GPT, the "set id" command gave me an error. So, I changed the "set id" command  to equal the number 27. After that I succesfully created the lost Recovery Partition. Now the Recovery Partition works as it should.
But ... the "Windows System Image" backup tool does not include the Recovery partition when creating the System Image...
You know why ?

Great article, thanks. I'd just like to add experience I had.
We have a server which was in-place upgraded  from Windows Server 2012 R2 to Windows 2019.
I did not realize the disk was MBR not GPT. Hence, when SET ID=de94bba4-06d1-4d40-a16a-bfd50179d6ac, I received

The specified type is not in the correct format.
For more information on the command type: HELP SET

The ID for MBR disks should be 0x27
set id=27

Official info from Microsoft
https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-setup-diskconfiguration-disk-modifypartitions-modifypartition-typeid

i got to the last step "reagentc /enable" and i get the error "REAGENTC.EXE: Windows RE cannot be enabled on a volume with BitLocker Drive Encryption enabled."

Hello,

Thank you for the clear step-by-step instructions. I do have one question: In creating the recovery partition, you use "create partition primary" which makes a partition "NTFS  Basic Data Partition." But other recovery partitions are simply "recovery partition." Will this new partition still be recognized as a recovery partition upon advanced boot?

Thanks!

Jeff