I have a pop up on my phone asking me to sign in when i allready am in my account,

The pop-up is likely a sign-in or verification prompt that is stuck or repeatedly triggered. Use these steps to clear it and restore mail flow:

1. Deny any sign-in prompts not explicitly requested
   • If the pop-up is an “Are you trying to sign in?” style prompt that you did not initiate, always choose Deny. This keeps the account secure and prevents unwanted sign-ins.
2. Turn off Outlook mobile sign-in requests (if using Outlook mobile to approve sign-ins)
   • In the Outlook mobile app:
     1. Go to Settings.
     2. Select Accounts, then choose the affected account.
     3. Select Account > Sign-in requests.
     4. Turn off the toggle for Allow sign-in requests.
   • This stops Outlook from sending/receiving sign-in approval prompts that may be blocking normal use.
3. Re-add Outlook mobile as a sign-in method only if needed
   • If Outlook was removed or misconfigured as a sign-in method and you want to use it again:
     1. Go to Settings in Outlook mobile.
     2. Accounts > select the account.
     3. Account > Sign-in requests.
     4. Turn on Allow sign-in requests.
4. Check for unrequested prompts or suspicious activity
   • If the pop-up appears when no sign-in was started, it may be due to someone entering the email/phone by mistake or attempting access.
   • Do not approve any prompts you did not start.
   • Review account activity at the recent activity page and, if anything looks unfamiliar, choose Secure your account.
5. If mail is still not arriving
   • After disabling sign-in requests and dismissing/denying the prompt, close and reopen Outlook.
   • If using Outlook on the web, sign out and sign back in.
   • If the issue persists, use the Outlook.com in-product Help option or the Outlook.com support link from the context to contact support while signed in.

References:

• Using Outlook mobile to sign in
• Fix email sync issues by removing a device from your Outlook mailbox