Using classic Outlook for Windows in business environments
That being said, it has not been "down". Webmail (accessible via phone browser) has been fine, albeit inconvenient, and bouncing network or cancelling password prompts has worked for most.
Running webmail your mobile browser is not reliable for when you are waiting for incoming emails or events. Power management at the browser level or OS level will choke the browser and connection, so you will not get incoming emails/data unless you are back on the browser tab and refreshing. This is not a solution, unless you keep that tab alive and constantly check it, you will not get timely event notification. Mobile browser has a lot more power savings techniques enabled, and I am not going to disable all those just so we can cuddle to MS' unreasonable stance of not rolling back whatever they changed.
You seem to have an unreasonable level of tolerance to MS issues. What next? Blame mobile email client for generating notification event for the password/auth error? And they should just go quietly? Or pretend it didn't happen? These are critical issue and naturally the client will throw a critical/urgent level event and notification.