I'm unable to sign into Outlook on mobile.

Question

I'm unable to sign into Outlook on mobile.

Grace Kaminski 0

Due to an issue, I needed to reinstall outlook on my phone. After reinstalling, I needed to sign back into my email and I'm encountering an issue. When the screen would usually pop up for Microsoft Authenticator to allow me to sign in, it just sits and infinitely buffers or just sits on a black screen. I've tried reinstalling again and clearing my cache with no luck. I am able to sign into my email on my desktop version of Outlook, but I really need this resolved so I can access my email on the go.

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Answer 1

Ivory 1,075 Independent Advisor

Hi Grace,

Since you're using Android devices, this issue can happen with Android WebView. especially Samsung. Could you tell me if you use a Samsung or another device?

In the meantime, please follow the steps below:

Settings -> Apps -> Search for "Android System WebView" -> App Details In Store -> Remove Updates
Reboot
Settings -> Apps -> Search for "Android System WebView" -> App Details In Store -> Update

Note: If "Android System WebView" doesn't appear in the app list, go to: Settings -> Google -> All services -> System Services -> Select "Android System WebView"
Reboot
Launch Outlook & log in.

I hope this provides enough clarity and helps you stay inform with your current situation.

If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.

If the answer is helpful, please click 'Yes' and kindly upvote it.

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Grace Kaminski 0 Reputation points

2026-08-22T19:12:45.97+00:00

Ivory,

I am using a Google Pixel. Unfortunately, turning off Android WebView did not seem to fix the problem. Any other fixes you can think of?

Thanks!
Ivory 1,075 Reputation points Independent Advisor

2026-08-22T21:52:25.9766667+00:00
Hi Grace,

In this case, can you please test sign-in on the web first from the default browser of your phone. Open a mobile browser on the Pixel and sign into Outlook on the web (with the same account. If that works cleanly, it confirms the account and MFA setup are fine and the problem is isolated to the app/broker handoff on the device.

Then turn off battery optimization for Outlook and Authenticator. Go to Settings > Apps > Microsoft Outlook > Battery > Unrestricted, then repeat the same for Microsoft Authenticator.

If you haven’t already, please clear the Microsoft Authenticator app’s storage as well as the cache and browsing data for your phone’s default browser, rather than clearing only Outlook’s cache. This can help remove any outdated authentication or sign-in information that may be causing the issue.

Please follow these steps:

Clear Microsoft Authenticator’s storage

Go to Settings > Apps > Microsoft Authenticator > Storage & cache.

Tap Clear storage (or Clear data, depending on your device).

Please note that Clear storage removes more data than simply clearing the cache, so you may need to sign in or set up Authenticator again afterward.

Clear your default browser’s cache

Open Settings > Apps and select your default browser, such as Google Chrome, Microsoft Edge etc).

Go to Storage & cache.

Tap Clear cache.

If the issue persists, you can also consider using Clear storage/Clear data, but please be aware that this may remove saved website data, cookies, and other browser settings.

Restart your phone

After clearing the Authenticator storage and browser cache, restart your phone completely.

Once the phone has restarted, try signing in to Outlook again.

Please note that you should have a secondary verification method set up before clearing the cache for your authentication, just in case you need an alternative way to verify your identity. You can set this up by following the guidance below: Change how you do additional verification | Microsoft Support
Ivory 1,075 Reputation points Independent Advisor

2026-08-24T13:59:17.2333333+00:00

Hi Grace,

I hope all is well with you.

I wanted to follow up on the issue and see if there have been any developments since our last communication.

Please let me know if there are any updates or if there's anything else I can assist with.

Looking forward to hearing from you.
Grace Kaminski 0 Reputation points

2026-08-26T00:13:27.01+00:00

Ivory,

Apologies for the delay. I hadn't even gotten to test the second fix you recommended because I opened Outlook this morning and it was suddenly all signed in and back to normal! It was very odd, but I'm just happy it worked haha.

Thanks for the help!
Ivory 1,075 Reputation points Independent Advisor

2026-08-26T15:21:58.4266667+00:00

Hi Grace,

I’m glad to hear that everything worked out well for you in the end. It’s reassuring to know that the situation was ultimately resolved positively, and I hope things continue to go smoothly for you moving forward.