Issue with Automatic Zoom Invitation

[VitalAthletics]

I set up zoom meetings with the goal or hope that zoom would automatically send an invitation to the client. It has not been doing that.

Due to this, I integrated my microsoft 365 account to zoom and checked off all boxes at the bottom of the profile tab in zoom. It still doesn't work. Instead of it clearly going through to the client, I get an email kick back and error instead saying 

Delivery has failed to these recipients or groups:

My-Email
Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:

Generating server: CH3PR16MB6140.namprd16.prod.outlook.com

My-email
Remote server returned '550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653 AS(7186) [PH0PR16MB4784.namprd16.prod.outlook.com 2025...