Here are the steps to manually clear CAS SonicWall Tenant on O365 portal.
Step#1 Admin User
Login to O365 Azure Portal and Delete CAS Service user.

Step#2 Rules
Go to “Admin Center” → Exchange. 2) Mail flow → rules 3) You should delete 3 rules (in case you have created inline rule): A. SonicWall - Protect B. SonicWall - Junk Filter C. SonicWall - Whitelist

Step#3 Connectors
Step-3: Connectors In “mail flow” → connectors, you should delete 3 connectors (or 2 if you didn't create an inline rule): A. SonicWall Inbound. B. SonicWall Outbound (is created when you create inline rule). C. SonicWall Journaling Outbound.

Step#4: Journal rule:
Go to “Compliance management” → Journal rule and delete it.

Step#5 Connection Filter:
