Updates released for Windows 10, Windows 11 and Windows Server back in January proved problematic for many users. There have been widespread reports of 0x80070643 errors, and Microsoft acknowledged the issue some time ago.
Microsoft tells users hit by flawed January security update that there's no fix coming in a future update, and they must manually work around the issue.
Earlier this year, Microsoft promised it was working on fix for "0x80070643 - ERROR INSTALL FAILURE that was happening when trying to install Windows 10 KB5034441 update. However, that's not to be.
Microsoft is now quietly pushing the KB5035942 update to users on Windows 11. This release enables Moment 5 features. We speculate a bit on why the company is re-rolling it out to more users now.