Outlook error with one mailbox

[GmainIVY]

Hi,

We are getting an error with one mail user on Outlook 2016. (See attached picture) Their account works fine in OWA It's just the client side. I have tested their account using the Microsoft remote connectivity analyzer and their account passes the tests. I was expecting their to be an issue with IMAP but it passed that test.

Any ideas on what the cause could be?

Kind regards.

[#2]

There's an ongoing issue on O365 side, which is probably what causes this:

Users can't access Exchange Online

EX223208, Exchange Online, Last updated: October 1, 2020 6:50 PM

Start time: October 1, 2020 7:52 AM

Status

Restoring service

User impact

Users may be unable to access Exchange Online using multiple protocols.

Are you experiencing this issue?

Is this post helpful?

Latest message View history

Title: Users can't access Exchange Online User Impact: Users may be unable to access Exchange Online using multiple protocols. More info: This is an incremental update to provide the latest status on the issue. Current status: While our telemetry indicates that impact has been mitigated for the vast majority of previously affected users, we're continuing work aimed at ensuring the service remains stable and resilient. We're restarting portions of infrastructure that continued performing below optimal thresholds after the update was reverted. This action is part of our ongoing traffic-management optimization procedures to alleviate the remaining impact. Please reference the post from Thursday, October 1, 2020, 5:08 PM (2:08 PM UTC) for complete details on this event. Next update by: Thursday, October 1, 2020, 10:00 PM (7:00 PM UTC)

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[#3]

Hi, yes there is an ongoing worldwide issue, you can follow their official Twitter or just check it out for any live updates:
https://twitter.com/MSFT365Status

[#4]

@HotCakeX 

Thank you for your reply. There is no issue logging in to Office 365, it's when this user is logged in to a domain computer and opening up the local outlook 2016 application. 

Kind regards.