Taiwo Triumphant, To better assist you on this, what specific region have you provisioned your resource? What is the exact error message you receive?
Are you referring to this Azure doc for the steps? Advanced Messaging for WhatsApp in Azure Communication Services
Typically, the 202 returned by the service means that your message was queued to be sent and not delivered.
Advanced Messaging for WhatsApp is only available in the following Regions (doc).
- Asia Pacific
- Australia
- Europe
- United Kingdom
- United States
Kindly let us know, I'll follow-up with you further.