Microsoft sign-in gets stuck in infinite loading on Galaxy S25 Ultra (Android 16 / One UI 8.5) across multiple Microsoft apps

Leonardo Melegari Deffende 0 Pontos de reputação
2026-08-07T11:11:40.1233333+00:00

Hi everyone,

I'm experiencing an issue that seems to affect Microsoft authentication on my Galaxy S25 Ultra, and I haven't been able to find a solution.

Device

  • Samsung Galaxy S25 Ultra (SM-S938B/DS)
  • One UI 8.5
  • Android 16
  • Google Play System Update: July 1, 2026
  • Build: BP4A.251205.006.S938BXXSBCZG3

Problem

Whenever a Microsoft app needs to display the Microsoft sign-in page, it gets stuck on an infinite loading screen.

This happens with:

  • Link to Windows
  • Microsoft Outlook
  • Microsoft Excel
  • Any other Microsoft App
  1. Open Phone Link on Windows.
  2. Scan the QR code with Link to Windows on the phone.
  3. Enter the pairing code.
  4. The app should open the Microsoft sign-in page.
  5. Instead, it stays on a white screen with a loading spinner forever.

Outlook

  1. Install Outlook.
  2. Tap "Add account".
  3. Enter my Outlook email address.
  4. Tap Continue.
  5. The Microsoft authentication page never loads and only shows an infinite loading spinner.

What works

  • I can sign in to https://account.microsoft.com using Chrome on the phone without any issues.
  • My Microsoft account credentials are valid.
  • The problem only occurs inside Microsoft apps.

Things I've already tried

  • Cleared cache and storage for Link to Windows and Outlook.
  • Reinstalled both apps.
  • Removed and re-added Phone Link on Windows.
  • Updated Google Play System to July 2026.
  • Updated all apps from both Galaxy Store and Play Store.
  • Restarted the phone multiple times.
  • Tried both Wi-Fi and mobile data.
  • Confirmed that Microsoft account login works normally in Chrome.

Additional information

Since both Link to Windows and Outlook fail in exactly the same way, it looks like the embedded Microsoft authentication flow is failing rather than an issue with a specific app.

Has anyone experienced this on Android 16 or One UI 8.5?

Is this a known issue with the Microsoft authentication library (MSAL), Android System WebView, or Samsung's latest software?

Any help would be greatly appreciated.

Thank you!

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  1. Kai-H 31,290 Pontos de reputação Equipe Externa da Microsoft Moderador
    2026-08-13T07:51:13.12+00:00

    (Please note that this is Brazilian Q&A Forum, any threads should be posted in Portuguese. However, I will still provide an answer in English based on your initial response. Our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.)  

    Hi, Leonardo Melegari Deffende

    The screenshots and cross-app behavior point to the Android authentication component rather than an account or password problem. I could not find a public notice confirming a general One UI 8.5 or Galaxy S25 Ultra outage, although similar Microsoft-app failures have been discussed after recent Samsung updates.

    Here are some suggestions you can try:

    In the Play Store, update both Android System WebView and Google Chrome, then restart the phone. Microsoft specifically recommends updating both components when an Android WebView problem affects Outlook.

    Set Chrome temporarily as the default browser under Settings > Apps > Choose default apps > Browser app. MSAL normally uses a browser or Custom Tab for interactive sign-in.

    Disable any ad blocker, Private DNS, antivirus web protection, or Samsung Secure Wi-Fi, then test again.

    As a diagnostic workaround, it is recommended that you install Outlook inside Secure Folder and test sign-in there. Similar Galaxy S25 Microsoft-app failures have worked in Secure Folder, indicating a damaged dependency in the main phone profile.

    If it still hangs, submit logs through Outlook > Settings > Help & Feedback > Collect Diagnostics, and send a Samsung Members error report immediately after reproducing it.

    Thank you for your patience in reading, I hope this information has been helpful to you. 

    If the answer is helpful, please click "Yes" and kindly upvote it. If you have extra questions about this answer, please click "Comment."    

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