Follow and apply:
1. Check the status of the service on https://status.live.com . Note: You must sign in on the site to see the exact status of the server your account may be located on.
2. Reset your password: You need to reset your password for the security of your account at https://account.live.com/password/reset. You may also try signing in from another computer, try signing into another service and check your firewall and antivirus program settings. To learn more visit: Outlook.com: Forgotten password or other sign-in problems.
3. Validate your account using your mobile phone: Outlook.com is committed to spam protection. Our anti-spam systems may place a variety of restrictions on accounts; one of them is blocking users from sending emails. If you receive an error message that your account is blocked from sending messages, you can resolve the problem by verifying your account with a mobile number at https://sms.live.com. You can refer this article: Verify your Outlook.com account.
Account blocked errors: If you’re getting a specific error message such as your account is temporarily blocked or there is some unusual activity in your account, refer to How can I get rid of temporary account blocked and other errors in Outlook.com? Follow the link specific to your issue/ error, and submit your account for investigation by following the link contact support
5. Possible browser issues: Log-in issue may also occur due to a browser problem. We suggest that you upgrade to the latest version of your browser. You can refer to these links for information about the best browser that you can use for your account; Best browser for Outlook.com. You can also optimize your browser by following the steps provided in this article: Optimize Internet Explorer . If you have not updated Silverlight, we recommend that you install the updated version of Silverlight, please visit ‘Get Microsoft Silverlight’ for instructions.
For other Login help, you may visit: https://www.emailloginhelp.org/