Hi JL,
Before moving on, I want to confirm :
1.whether other people in your company can receive emails using Office 365 account.
2.If you can receive internal emails
Additionally, please send emails from Hotmail account or Gmail account (not in Outlook)to your Office 365 account to see if the issue persists.
Given the current situation, you could provide your domain name for us to further research. Since this is your privacy, I will send a private message to you to request your domain name. Therefore, you could reply me through private message.
To access the private message :
1.Please go to the Your details section on the right side of the community site.
2.Click Private messages.
3.Click the subject title of the response to read the message and reply with your domain information.
Thanks,
Linda Wang