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Diane_Poremsky_MVP 

I was attempting to edit.  I'd received the "can't connect/permission" email we're all familiar with for a gmail account, but couldn't do anything because of the "Unable to load" issue. When that finally resolved (for me, anyway), I attempted to update/reconnect the account. The attempt didn't work and when the screen came back, the connected accounts list was gone.

I have five other connected accounts via Outlook.com. I had them as POP accounts in Desktop too.  Outlook.com stopped pulling in these accounts for the most part. Only when I opened Desktop would email the appear in Outlook.com and Outlook Android (again, for the most part). It was like Desktop was now in charge, and Outlook.com and Android only updated when it did (instead of them syncing with .com.)

I ended up disabling receive in Desktop and just had everything for my domain and gmail forwarded to my friendly outlook email. That worked - "for the most part" - then I started getting duplicates (but not always) This tells me SOMETHING was still pulling pop mail (I had email sets not to delete from server). I checked email headers for the duplicates, and sure enough, one was forwarded and one wasn't.  Because Desktop "receive" was (supposedly) disabled, I'm assuming it was Outlook.com, but IDK

My confusion about connected accounts and MS 365 Family, comes from stuff like this: 

https://www.microsoft.com/en-us/microsoft-365-life-hacks/organization/use-outlook-manage-other-email-accounts 

https://support.microsoft.com/en-us/office/add-your-other-email-accounts-to-outlook-com-c5224df4-5885-4e79-91ba-523aa743f0ba 

https://support.microsoft.com/en-us/office/connecting-additional-email-accounts-in-outlook-on-the-web-is-no-longer-supported-d7012ff0-924f-4f78-8aca-c3912d886c4d?ui=en-us&rs=en-us&ad=us 

Not that it really matters - I was grandfathered, so they should still be there - right?