Sending, receiving, and organizing email in Outlook.com
Hi @Adi Garces
Since messages sent to your other aliases arrive successfully, the mailbox itself is receiving email. The issue appears to be specific to the address currently marked as your primary alias.
Please sign in to your Microsoft account, open Your info > Manage how you sign in to Microsoft, and confirm that the affected address is still listed and marked as Primary alias. Please do not remove the address while checking, as Microsoft-domain aliases may not be recoverable after removal.
Also, ask one affected sender whether they receive a non-delivery report. If so, please share the error code shown in that report, with personal information removed. This will help determine whether the message is being rejected before reaching the mailbox.
Please feel free to let me know if you have any further updates, thanks.
If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.