Hi,
Nice to meet you! My name is Randy and I'm an independent advisor.
You can try this suggestions to fix this, first log into Outlook.com and check Rules and Junk Email in Settings, since filters or blocked senders might redirect mail. Next, check Blocked accounts/domains in your account settings to be sure nothing is being rejected. Then, test by sending an email from another provider (like Gmail) to see if it bounces back or just disappears, which shows if delivery is failing. Finally, confirm your account is active by signing into account.microsoft.com.
Just a quick question, when someone emails you right now, do they get a bounce/error notification, or does the email just disappear?
Kind regards,