Cannot add email account to outlook app on iOS

Anonymous
2026-06-25T03:20:49.4266667+00:00

I repeatedly receive the following error message when I try add a personal email account to the outlook app on iOS: AADSTS165000: Invalid Request: The user session context is missing. One or more of the user context values (cookies; form fields; headers) were not supplied, every request must include these values and maintain them across a complete single user flow.

Please help me fix this.

Outlook | Outlook for mobile | Outlook for iOS | For home
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Answer accepted by question author
Ben4724 4,480 Reputation points Independent Advisor
2026-06-25T04:08:51.14+00:00

Hi there!

Based on the error message you provided, it usually happens due to expired or blocked cookies, browser restrictions on iOS, corrupted app data, or network interference from a VPN or security app breaking the authentication flow.

I suggest to try the following first:

  1. Force-close and relaunch Outlook**
    2. Restart your iPhone or iPad
    **3. Check for iOS and Outlook app updates
  2. Clear Safari cookies and website data on your iOS device.
  3. Ensure Safari is not blocking cookies. In Settings → Safari, make sure Block All Cookies is turned **off

**Once you have completed steps 1-5, try to setup your account again. If you are connected to a VPN, make sure to turn it off first then try to add your account on the app.

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