We are ID verification and fraud prevention service. Many of our customers ask us to send OTPs and other messages to their end-consumers. As part of the process, we want to enable Whatsapp-based messaging for our customers.

Our business has been verified on Meta. We've been able to send test "Hello World" messages via the test number that Meta gives when we create our app. However, we are unable to add our own phone number to the continue.

I get this message: There was a problem registering . Unsupported post request. Object with ID '421842257686369' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api

We even tried going thru Glitch and create a webhook etc to see if that works but to no avail. We're clearly missing some step.

Appreciate the help.