@Geebes @DocDavid Some additional data points. I setup the same Gmail account on my MacBook on both Mac Mail and Outlook. This afternoon Mac Mail showed all accounts disconnected again; I checked the...

That's interesting as I have the exact same setup, including the MacBook Pro. Indeed turning WiFi on and off reconnected all of the IMAP blocked accounts; thank you very much for the tip. As an...

@sunday9pm I am having the identical issue, what was the resolution? Thank you.