After addressing a widespread outage that affected Outlook.com users worldwide on Monday, Microsoft has asked iPhone users to re-enter their credentials to regain access to their Outlook and Hotmail accounts via the default Mail app.

Microsoft confirmed the incident yesterday morning, saying that customers were experiencing intermittent sign-in issues that prevented them from accessing their mailboxes via Outlook.com.

In a later update, it added that some of the affected users were also being signed out of their accounts and seeing "too many requests' errors.

Before mitigating the outage, roughly 10 hours after the first user reports, Microsoft blamed the Outlook.com sign-in issues on a "recently introduced change" but didn't share any further details.

On Monday evening, around 7 PM UTC, the company said the service health had returned to normal, but added that iOS users "must" manually re-enter their credentials to access their accounts via the default Mail app by going through the following step-by-step procedure:



Open the Settings app on your iPhone.
Scroll down and tap on Mail.
Select Accounts under the Mail settings.
Tap on the email account for which you need to re-enter the password.
Tap Account Settings or the Password field directly (depending on your iOS version).
Enter the updated or correct password in the Password field.
Tap Done to save the changes.
Open the Mail app to confirm that the account is syncing properly and emails are being sent/received.

Microsoft hasn't shared more information about the outage's root cause and hasn't disclosed which regions or how many users were affected.

However, the incident was flagged as causing "service degradation," a label typically used for incidents with noticeable user impact that don't take the service offline for everyone.