Sometimes a "block" is just a rogue rule moving your mail to a hidden folder. Go to Settings > Mail > Rules .
Outlook enforces strict limits for mass email: how to unblock outlook email
The fastest way to unlock your account is by requesting a security code online. Sometimes a "block" is just a rogue rule
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If the delisting portal rejects you:
Look for the address in the Blocked senders and domains list.
If you are missing emails from a specific person, they might be on your "Blocked Senders" list.