Sign-in & Login Problems

Fix Microsoft Apps Keeping Signing Out on iPhone After iOS 18 Update

Maira Mehtab Sep 21, 2026 869 views

Question details

Users are experiencing persistent sign-out issues with Microsoft Lens and Microsoft 365 on their iPhones after upgrading to iOS 18.

Product: Microsoft 365 and Microsoft Lens
Device & OS: iPhone (iOS 18)
Scenario: Using Microsoft productivity apps on an iPhone that was recently updated to iOS 18.
Observed behavior: The apps repeatedly force the user to sign out, requiring continuous re-authentication and disrupting workflow.

Before you start

Ensure you have your Microsoft account email and password handy, as you will need to log back into your apps after performing the troubleshooting steps.

Solution 1Recommended

Reinstall Apps and Restart Your iPhone

This is the most effective method for clearing corrupted cache data and resetting app login tokens that may have been disrupted during the iOS 18 update.

Major iOS updates can occasionally cause compatibility issues with app security tokens stored on the device. Reinstalling forces a fresh connection.

Uninstall the affected apps

Long-press the Microsoft 365 or Microsoft Lens app icon on your iPhone home screen, tap 'Remove App', and then select 'Delete App'.

Restart the iPhone

Press and hold the volume button and the side button until the power-off slider appears. Drag the slider, wait 30 seconds for the device to turn off, then press and hold the side button to turn it back on.

Reinstall from the App Store

Open the App Store, search for Microsoft 365 or Microsoft Lens, and tap the download icon to reinstall.

Sign in and verify

Open the newly installed app, enter your Microsoft credentials, and check if the session remains active.

Submit Feedback: If the problem continues after reinstallation, use the in-app feedback option (usually under Settings > Help & Feedback) to report the bug to Microsoft developers.

Solution 2

Contact Your Microsoft 365 Administrator

Use this solution if you are logging in with a work or school account and the basic reinstallation does not resolve the issue.

Free Microsoft Office alternative

Try WPS Office for iOS as a Reliable Alternative

If Microsoft 365 apps continue to experience login loops or instability on your iOS 18 device, consider switching to WPS Office. It provides a stable, unified app experience for viewing and editing documents right on your iPhone without frustrating mandatory login interruptions.

1. Download WPS Office: Search for 'WPS Office' in the Apple App Store and download the application.
2. Open your files: Launch WPS Office and tap the 'Files' tab to easily browse and open your existing documents.
3. Edit without interruption: Begin editing your Word, Excel, or PowerPoint files immediately with high format compatibility and stability.

Fully compatible with Microsoft Office formats (Word, Excel, PowerPoint)All-in-one app structure saves iPhone storage spaceStable performance optimized for the latest iOS updatesNo mandatory sign-ins required for basic local file editing

microsoft office alternative - wps office

Frequently Asked Questions

Why do Microsoft apps keep signing me out after an iOS update?

Major OS updates can sometimes clear security tokens, disrupt the keychain access where passwords are saved, or cause temporary compatibility glitches that prevent the app from recognizing your active login session.

Will I lose my files if I uninstall Microsoft 365 from my iPhone?

No. Files saved to OneDrive, iCloud, or SharePoint will remain secure in the cloud. However, ensure any local drafts stored exclusively within the app are synced or backed up before deleting the app.

Can I bypass the login issue by using the mobile web version?

Yes, as a temporary workaround, you can open Safari or Chrome on your iPhone, navigate to office.com, sign in, and access your files via the web versions of Word, Excel, and PowerPoint.

Login & Account Issues