StayingAlive for chrome was not working for me on outlook.office.com :(
This greasemonkey script reloads the page just short of every 5 minutes: https://openuserjs.org/scripts/devinrhode2/reload_outlook_every_9_minutes
(You need to install tampermonkey for chrome, or another user script extension for other extensions)
It's on github as https://github.com/...
The outlook email address you are using belongs to an organization, so the administrator needs to use the Microsoft 365 Admin center to enable or disable SMTP AUTH on specific mailboxes.
The steps to do this are:
Open the Microsoft 365 Admin Center and go to Users > Active users.
Select the user, and in the flyout that appears, click Mail.
In the Email ...