Outlook | Outlook 移动版 | Outlook for iOS | 商业版
在商业环境中使用 Outlook for iOS 处理电子邮件和日程安排
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手机上登录Microsoft 365工作账户，你们组织可能会需要先登录Intune公司门户app.
Unable to log in to Outlook mobile app
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Yingjun Gu
0
信誉分
My Outlook account is the Enterprise version, and I can't log in to the Outlook mobile app. It keeps showing this message, and changing my network and deleting and reinstalling the app haven't worked. What could be causing this? Are there any solutions?
Outlook | Outlook 移动版 | Outlook for iOS | 商业版
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Jade Ng 15,860 信誉分 Microsoft 外部员工 审查方2026-08-04T03:09:12.8+00:00 Disclaimer: This platform is in Chinese (Simplified). However, I noticed that your message was written in English, so I will respond in English to ensure clarity and provide better assistance.
Dear @Yingjun Gu,
Thank you for reaching out. I'm sorry to hear you're having difficulty signing in to the Outlook app on your iOS device.
Since you've already tried changing networks and reinstalling the app without success, the issue may be related to authentication, device registration, or security policies configured for your organization's Microsoft 365 account rather than the Outlook app itself.
To help narrow down the cause, could you please provide the following information?
- A screenshot of the exact error message you receive in Outlook for iOS.
- Are you able to sign in successfully to Outlook desktop or Outlook on the web?
- Does the issue occur before or after the Microsoft Authenticator verification step?
Thank you for your patience and understanding. I'm looking forward for your reply.
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Yingjun Gu 0 信誉分
2026-08-04T03:50:42.0733333+00:00 Before the Microsoft Authenticator verification step, login is possible on both desktop and web platforms, only on mobile devices.
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Jade Ng 15,860 信誉分 Microsoft 外部员工 审查方
2026-08-04T03:53:14.6766667+00:00 Dear @Yingjun Gu,
Thank you for the update. Since you're able to sign in successfully on both the desktop app and Outlook on the web, but the issue occurs only on the Outlook mobile app before the Microsoft Authenticator verification step, could you please provide a screenshot of the exact error message displayed on your mobile device?
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Yingjun Gu 0 信誉分
2026-08-04T03:57:24.85+00:00 The attachment has been uploaded; this is the error message.
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Jade Ng 15,860 信誉分 Microsoft 外部员工 审查方
2026-08-04T04:00:42.6766667+00:00 Dear @Yingjun Gu,
Thank you for the update. Unfortunately, I’m unable to view the screenshot you mentioned, as it does not appear to have come through on my end.
Could you please resend the screenshot of the error message?
I appreciate your patience and look forward to your reply.
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Yingjun Gu 0 信誉分
2026-08-04T04:03:57.5033333+00:00 Service Issue
This app could not be protected due to an issue with the Intune service.Please try to sign again in a few minutes.
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Jade Ng 15,860 信誉分 Microsoft 外部员工 审查方
2026-08-04T07:12:36.29+00:00 Dear @Yingjun Gu,
Based on the message shown, the issue appears to be related to Microsoft Intune, which is used by many organizations to apply security and app protection policies to mobile devices. The Outlook app is unable to complete the required protection process for the account, preventing sign-in from proceeding.
The error "This app could not be protected due to an issue with the Intune service" typically indicates that your organization is using Microsoft Intune App Protection Policies or Mobile Application Management (MAM), and Outlook is unable to complete the required protection process on the mobile device. Since you're able to sign in successfully on Outlook Web and the desktop app, the issue appears to be isolated to the mobile management layer.
Could you please check with your IT administrator whether your organization has deployed Microsoft Intune App Protection Policies or Mobile Application Management for mobile devices?
I appreciate your patience, and I am here to help. Looking forward to your response!
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Jade Ng 15,860 信誉分 Microsoft 外部员工 审查方
2026-08-05T04:13:59.8133333+00:00 Dear @Yingjun Gu,
I hope this message finds you well!
I just wanted to check in and see if you have any updates or additional information you’d like to share regarding your situation. If there's anything new or if you need further assistance, please don’t hesitate to let me know.
Looking forward to your response!
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