Sign-in with this account on the device registration page, then try enabling passwordless for the account. Check that your phone is not running any malware like a rootkit for example. If you are still not able to add your account, please contact Support or reach out to your IT admin.

Check the Xbox services, games, and apps for any service outages.

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To install Authenticator on your iOS device Scan the QR code or download and install Authenticator from the Apple app store. Get the app

手写签名可让你的文档具有个人风格。 你可以扫描你的签名，将其存储为图片，然后在 Word 文档中插入签名。 扫描手写签名并插入手写签名的图片 在纸张上写下您的签名。 扫描该页面并以常见的文件格式将其保存在计算机上：.bmp、.gif、.jpg 或 .png。

Microsoft Lens is an app for your iOS device that lets you easily capture, use, and share information from documents, whiteboards, photos, or business cards.

Download and install Microsoft Authenticator app Download and install the Microsoft Authenticator app for Android, iOS or Windows Phone. Set up the Microsoft Authenticator app Choose the mobile app Open a browser on your computer and go to portal.office.com. Sign in to your Office 365 for business account.

First go to Device Settings > Contacts and confirm that the 'Default Account' is set to 'iCloud'. If you do not see this setting that is OK, the setting should only be available if you have more than one account added to your device.

Important: Apple has fixed an issue in 11.0 that caused a "Cannot send mail" error for Outlook.com and Exchange mail accounts. If you're on iOS 11.0, update your device to iOS 11.0.1 or later to fix the issue.

There are three options for removing contacts that you've exported from your device: Go to Settings, select the email account, and turn the Save Contacts slider to the Off position.