I recently did a clean reinstall of Windows and all software. This was prompted by a problem with iCloud for Windows: there was a message that the directory for iCloud Photos could not be created. While this problem is now gone, ironically another has appeared:

The iCloud add-in for Outlook doesn't work for the main profile I use in my Outlook. This is a profile generated by G Suite Sync (my main email is from that environment). The program says the add-in is active, but it's not in the toolbar. If I open Outlook using a different profile, the add-in works fine.

I've tried several registry edits around "Do not disable" as found in other threads, but nothing has worked so far.

Some screenshots:

Opening Outlook:
iCloud Add-in for Outlook doesn't work for G Suite Sync profile-screenshot-2021-09-02-204612.png

iCloud not in toolbar:
iCloud Add-in for Outlook doesn't work for G Suite Sync profile-screenshot-2021-09-02-202559.png

Outlook says it was loading slow, but not disabled because I had earlier put it in the "Always enable" list. I have gone through many iterations on this screen (like always disable -> restart -> always enable -> restart -> do not monitor -> restart, etc.; all of this both with and without Admin privileges):
iCloud Add-in for Outlook doesn't work for G Suite Sync profile-screenshot-2021-09-02-203022.png

Under Options, Outlook also tells me the add-in is active:
iCloud Add-in for Outlook doesn't work for G Suite Sync profile-screenshot-2021-09-02-202950.png

As mentioned: when using the other profile there is no problem with the add-in:
iCloud Add-in for Outlook doesn't work for G Suite Sync profile-screenshot-2021-09-02-203646.png

Thank you for your help!