You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors. Tips: If you're using mobile data, try switching to Wi-Fi and vice-versa. Make sure Airplane mode is off.

Add, remove or update an email address or phone number. If you want to make changes to the email addresses or phone numbers associated with your Microsoft account, use our guided support tool below to help you update the right information in the right way.

Go to the Microsoft account sign-in page at https://account.microsoft.com and enter your email address. If you see a message that says "We couldn't find an account with that username." or "That Microsoft account doesn't exist", then the address you entered is not a Microsoft account. If you believe it should be:

Help with a work or school account password. I need to talk to a customer support agent. Learn how to get Microsoft account help, troubleshoot sign in issues, keep your account secure, and manage your Microsoft account dashboard.

Here's how to unblock your account. Note: If either your Outlook.com mailbox or your OneDrive storage is full, you cannot send or receive email. Check your Outbox or your mailbox storage to see what's taking up space. Learn more.

To find a customer service phone number in your country, please click a region and find your country. Note: Support cases for Surface devices may only be initiated online.

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription. Tip: Get tech expertise with Business Assist.

Detailed information about downloading and using Microsoft Authenticator in China. The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Install Microsoft 365 2019 or 2016 on a PC. Remember a one-time purchase version of Microsoft 365 is licensed for one install only. Depending on your browser, select Open file (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

Mark email as junk or block senders in Outlook.com. Filter junk email and spam in Outlook on the web. When you no longer want to see messages from someone, you can block them so that messages are automatically are moved to the Junk Email folder.