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This is the error I get on my iPhone:
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.
Managing profiles, sync settings, and sign-in options in Edge on iOS
Hello
What exactly are you logging into on your iPhone? A certain website? If so, what URL and is it via Edge?
Or a certain app? If so, which app?
Is this for an organization issued account?
What exactly are you logging into on your iPhone? Outlook Email app
A certain website? If so, what URL and is it via Edge? No
Or a certain app? If so, which app? Outlook
Is this for an organization issued account? Personal MC 365 Account
ok, this information should have been provided especially when you put the question in the Edge category.
So, this is an outlook.com or hotmail.com email address, if not, tell me what the email domain is. Such as @gmail.com, or @somethingelse.com
When you added it, did you use the Email account option on the top? Did this error come up after verification?
This is an outlook.com email address. The system would not even allow me to verify it.
Can you launch the safari app on your phone, and see if you can log in via https://www.outlook.com?
Yes, that is the only way it works. At this point I already erased my phone and am reinstalling my apps.
I see. See if it works after the reset. Unless you meant, the reset doesn't appear to address the issue.
If the issue continues after the reset, I suspect that it can be a bug. I noticed a few others having the exact same issue. There's no official announcement right now regarding this from Microsoft.
You can also try to add your outlook.com address via iPhone's own email app instead of the Outlook app for now, see if that works. It will be easier than checking via the web.
After the full erase all content in now works.
oh good. glad it works.
Yes, but I lost all my customizations and saved credit cards and who knows what else. Restore only brings back so much.
I am not sure how an Outlook email app is saving your credit cards, etc? Unless you are talking about the iPhone settings specifically. That unfortunately is not within the supporting scope here. Sorry.
AI answer
The error indicates that required user session context (cookies, form fields, or headers) is not being preserved between requests on the iPhone. This typically happens when the browser or embedded web view used for sign-in does not allow cookies or does not share them correctly.
For iOS sign-in flows that rely on Microsoft identity (including Microsoft 365 and Entra ID–backed apps), the sign-in experience depends on cookies being stored and reused to maintain a single user flow. If cookies are blocked, cleared, or isolated between requests, the service treats each request as a new session and fails with an error like AADSTS165000.
To address this on iOS:
These steps ensure that the required user context values (cookies and related state) are maintained across the complete sign-in flow, preventing repeated failures with missing session context.
References: