Sending, receiving, and organizing email in Outlook.com
Hello
Any chance you use a third party email address as your Microsoft account username, such as a gmail.com or a yahoo.com address?
When your Microsoft account uses a non-Microsoft email address, it does not have its own email functionality. The actual sending and receiving of emails still happens through your third party email provider. As a result, when you go to Microsoft's email platform to use the email service, which is outlook.com, it will show a placeholder email address with some random number/******@outlook.com.
To give your Microsoft account proper email functionality, you can create a Microsoft-based email alias and set it as the primary alias. Here is how:
Go to https://account.live.com and sign in to your personal account.
Click on "Your Info," then choose "Sign-in preferences," and select "Add an alias."
Choose to create a new alias. It will allow you to create one that's outlook.com.
After creating it, set it as your primary alias.