Hello,

Sorry for the Inconvenience,

Please login to https://outlook.live.com Sign in with MSA & send a test email to yourself.

May be there is verification pending on your account.

Complete the verification.

Also go to a website https://account.live.com/reputationcheck

Sign in with the MSA

Enter the cell phone number & use the code sent to the Cell phone to verify.

This might resolve the issue

If Issue persists please follow the below link to contact the MSN Technical support team.

https://support.microsoft.com/en-us/contactus/

Thanks

MSN Support Team