Issues to configure o365 account in mobile device (iphone)

Hi @Vitor Oliveira, 

Thank you for posting your question in the Microsoft Q&A forum.   

Based on your description, the iPhone sign‑in flow reaches Microsoft Authenticator and then shows Network Timeout (2602) when adding the corporate account. I truly appreciate the thorough troubleshooting you have already completed, including the device reset, network settings reset, and manually adding the account in Microsoft Authenticator. 

This timeout typically occurs when the secure “broker” handoff between the app (Outlook/Teams) and Microsoft Authenticator cannot complete within the allowed time. Common contributors include VPN/DNS filtering or firewall controls blocking required Microsoft/Apple push notification endpoints, background activity being restricted on iOS, or a stale device/broker registration that needs a clean re‑establishment. In some environments, Conditional Access or Intune enrollment requirements must complete before the sign‑in can progress on the device. 

Below are some workable options that might be the most appropriate for your current situation: 

1/ Isolate with the web client 

• Please go to your computer then open your chrome or edge browser as the only recommended browsers to access MS Teams online. 
• Please go to MS Teams online https://teams.microsoft.com 
• Then try to log in. 

2/ Reset the Teams app by clearing the client cache 

• Fully quit Teams, then clear the Teams cache for your iOS, and relaunch Teams to sign in again. 
• After clearing cache, restart the device, then update Teams to the latest version (or reinstall if needed) before attempting sign‑in again; this aligns with Microsoft’s guidance to ensure the client is current when troubleshooting sign‑in errors. 
• Fix Teams sign-in errors - Microsoft Teams | Microsoft Learn 

3/ Network and allow‑listing checks 

• Try on a personal hotspot to rule out corporate Wi‑Fi filtering 
• If the issue only happens on corporate networks, ask the network team to allow outbound access to these endpoints: 
  • Login.microsoftonline.com 
  • Device.login.microsoftonline.com 
  • enterpriseregistration.windows.net 
  • aadcdn.msauth.net, aadcdn.msftauth.net 
  • msauth.net, msauthimages.net 
  • Apple Push Notification service (APNs) endpoints as required by iOS 
• Ensure any MDM web content filters or secure web gateways are not intercepting or decrypting Authenticator traffic 

4/ Contact IT administrator 

Since your account is managed by your organization, please contact your IT administrator to review your permissions and policies. If the issue persists after these checks, ask your IT administrator to submit a support request directly to Microsoft Support team.      

They can raise a support ticket by visiting: Get support - Microsoft 365 admin | Microsoft Learn 

As community moderators, we appreciate your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have visibility into deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.    

I hope this information is helpful. Please follow these steps and let me know if it works for you. If you have any updates regarding the issue, please feel free to share them with me.      

Thank you for your patience and your understanding.  

I look forward to continuing the conversation. Wishing you a smooth rest of your day. 

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