Microsoft sign-in fails inside Outlook, Teams and Gmail on new Samsung Galaxy S26 Ultra (works in Chrome)

Question

Microsoft sign-in fails inside Outlook, Teams and Gmail on new Samsung Galaxy S26 Ultra (works in Chrome)

Victor Clipa 0

Hello Microsoft Support,

I recently bought a Samsung Galaxy S26 Ultra (One UI 9) and I cannot sign in with my Microsoft account in any app. I would like to know if this is a known issue and whether a fix is planned.

PROBLEM

In Outlook and Teams, the app freezes/crashes right after I enter my email address on the Add account screen (when the Microsoft sign-in page should load).
In the Gmail app, adding an Outlook account fails with "Unable to authenticate".
Adding a Google account inside Outlook also fails.

WHAT WORKS

Signing in to outlook.live.com / outlook.office.com in Chrome works normally. So my Microsoft account and my network are fine. Only the sign-in flow inside apps (WebView / in-app browser) fails.

WHAT I HAVE ALREADY TRIED (no success)

Updated Android System WebView and rebooted. Only one WebView implementation is available in Developer options.
Set Chrome as the default browser.
Tested in Safe mode: same failure, so it is not caused by a third-party app.
Installed Outlook inside Secure Folder: same failure.
Disabled Samsung Auto Blocker (this fixed another app, Revolut, but not Outlook/Teams).
Checked for system updates, including Google Play system update.
Performed a factory reset (after first restoring data with Smart Switch) and set the phone up as new, without restoring any data. The problem persists.

NOTE ABOUT SAMSUNG SUPPORT

Samsung support said the cause may be outdated Microsoft authentication certificates or tokens on the device. This cannot be the case, because the issue continues after a factory reset on a clean setup.

CONCLUSION

This looks like a compatibility bug between the Microsoft apps' sign-in flow (authentication via WebView / Custom Tabs) and the current WebView/One UI 9 build on the Galaxy S26 Ultra. Similar reports exist on Microsoft Q&A and Samsung community forums.

REQUEST

Please let me know:

Whether this is a known issue and if there is a workaround.
Whether a fix is planned on the Microsoft side (Outlook / Teams / Authenticator apps).
Whether you need logs or an Outlook diagnostic report (Settings > Help & Feedback > Contact Support) to investigate.

Device: Samsung Galaxy S26 Ultra, One UI 9 (Android version 17)

Apps: Outlook for Android, Microsoft Teams ()

Hornblower409 18,830 Reputation points

2026-11-09T05:16:15.3633333+00:00

@Victor Clipa said

Adding a Google account inside Outlook also fails.

The fact that adding a Google account to Outlook also fails may be significant.

1 -- What exactly happens when you try to add the Google account in Outlook? Does Outlook freeze/crash at the same point, before the Google sign-in page appears, or do you get farther?

2 -- Can you add that same Google account successfully to the Gmail app or another app on the phone?

1 answer

Your answer

Hornblower409 18,830 Reputation points

2026-11-09T05:16:15.3633333+00:00

@Victor Clipa said

Adding a Google account inside Outlook also fails.

The fact that adding a Google account to Outlook also fails may be significant.

1 -- What exactly happens when you try to add the Google account in Outlook? Does Outlook freeze/crash at the same point, before the Google sign-in page appears, or do you get farther?

2 -- Can you add that same Google account successfully to the Gmail app or another app on the phone?

Answer 1

Based on the documented Outlook mobile guidance and the similar Android reports, this is consistent with an app-side sign-in flow issue rather than an account or network problem, especially since sign-in works in Chrome and the failure happens when the in-app sign-in page should load.

Supported workarounds from the available guidance:

Update Android System WebView and Google Chrome from the Play Store, then restart the device.
Clear the Outlook app cache:
- Settings > Apps > Outlook > Storage > Clear cache
- This keeps app data.
Update Outlook from the Google Play Store.
If Outlook is crashing on launch or during sign-in, force stop it first:
- Settings > Apps > Outlook > Force stop
- Then clear cache and retry.
For Outlook mobile sign-in issues with a Microsoft personal account, use the Microsoft sign-in helper flow referenced in Microsoft Support.
If recurring password prompts started after security standard changes, install the latest Outlook mobile version.

What is supported about known issues:

Microsoft documents that Android WebView can cause Outlook Mobile to crash, and updating Android System WebView and Google Chrome can resolve it.
Similar Microsoft Q&A cases describe blank pages, infinite loading, black screens, and app login failures on Android devices, with WebView-related remediation suggested.

What is not confirmed in the available documentation:

No supported statement confirms a known compatibility issue specifically for Samsung Galaxy S26 Ultra, One UI 9, or Android 17.
No supported statement confirms that a Microsoft-side fix is planned for that specific device/OS combination.
No supported documentation here provides a log collection or Outlook diagnostic submission process beyond using Get more help with Outlook / Contact Support from the app support path.

Because the issue persists after WebView update, Safe mode, Secure Folder testing, and factory reset, the remaining supported path is to use the in-app support/contact route for Outlook mobile and continue with Microsoft support for investigation.

References: