Hey again! Thanks for that.
Can you also confirm if similar behavior happens on iOS devices, (If you have them), it sounds like it wouldn’t as the website appears to work okay.
I know it’s happening on more than one of your Macs, but on one of them can you relaunch Finder and see if it makes any difference?
Apple > Force Quit > Finder > Relaunch.
And I know more isolation may need to be done, but if you keep a backup, I may try this which helped me fix a similar issue recently with iCloud Drive, although it would say more if we knew if it happened in safe boot, on another network, or in another user account:
First I always keep a local copy of my documents, you can disable iCloud Drive and save a copy, likewise Time Machine should back it up, considering you don’t use Optimize Storage, but still, it’s not exactly reliable right now.
Move this folder to the Desktop:
~/Library/Application Support/CloudDocs
The restart your Mac.
Next, open Activity Monitor in /Applications/Utilities, search “bird” double click the process and select Quit.
And finally relaunch Finder:
Apple > Force Quit > Finder > Relaunch.
I could be way off but this worked for me after many, many other steps had failed, but otherwise:
Safe Boot
Test admin account
Different Network
Good luck! Let me know how it goes!