Why I'm not able to login my outlook account in mail app in iPhone

There is a known issue they are working on today - Issue ID EX1021490

Users may be experiencing issues with accessing email messages on the iOS native mail app

Users may be able to click "continue" when prompted and navigate back to re-entering their password to attempt to resolve impact. Additionally, some users may be able to bypass the prompt to sign-in by clicking "edit settings" and then entering into the app

Any user serviced by the affected infrastructure may experience issues with accessing email messages on the iOS native mail app.

10:44am PT

Our analysis of the diagnostics logs has identified authentication failures, which we're continuing to investigate so that we can isolate the source of the impact.

11:47am PT

Our investigation into the authentication failures has so far revealed that there is an issue with the authentication tokens being sent from the iOS native mail app. We're continuing to investigate and determine the next steps to troubleshoot the issue.

Next update expected by 2pm

I am having the same problem. I was prompted to re-enter my password. I did and it was not accepted - wrong password when I know that is the password. Tried everything. Can still log into my email via my desk top computer. Deleted the mail account on my iPhone, and now it keeps saying that my email address doesn't exist. This is a work email that I am battling with and am on the road constantly. I need to receive critical updates during the day and I am now unable too. I have been logging into my account via the phone web browser - but that is not ideal - and I don't get notified of a new email. There has to be a simple solution to fix this!! Come on Microsoft with all your techs - how can this be happening?

I'm having the same problem with my iPhone but not with my iPads. The Apple mail app works fine on my iPad. As it's the same APP what is the real issue? Perhaps a bug in the latest update? I updated my iPhone, but not my 2 iPads and they work just fine.

I followed GoDaddy's advice (they hold our domain name) and deleted my email account. When I tried to add it again, I received an Error Message - Application error: a client-side exception has occurred (see the browser console for more information). I have no idea what that means.

Stupidly I did not realize I would lose all my contacts once I deleted my email account.

Any new information on this? Same issue here.

After days of trying the same things finally managed to get in and reset password. Now have mail access.

Has anyone heard anything form Microsoft? I only have one user that has the issue but he's at the top of the executive list.

This needs to be fixed MIcrosoft.