Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I'm having issues syncing shared lists with my wife. I first thought the issue was with the iPhone app, but no. To test, I opened each account with the web version of To Do in the browser and also the phone apps. (So two browser tabs and two phones.) When a list invitee adds an item from web or phone, it's propagated to both accounts (web and phone). But when the list owner adds an item, it's only propagated to that user (web and phone). So definitely the issue is on Microsoft's servers.
I would qualify this as a critical issue. If you can't reliably sync lists, then the app is no good. One needs to have trust in the syncing, and it's been failing too much lately.