63020: Twilio encountered a Business Manager account error

This error occurs when Twilio cannot send messages for your business because the linked Meta Business Manager account has not accepted Twilio's invitation. Verify the WhatsApp billing account associated with your business before you try again.

• You have not accepted Twilio's invitation in Meta Business Manager to send messages on your behalf.
• The WhatsApp billing account associated with your business is not verified.

• Open Meta Business Manager and accept the invitation from Twilio to send messages on your behalf.
• Verify the WhatsApp billing account associated with your business.
• Retry the message after the business account and billing setup are complete.

• Overview of the WhatsApp Business Platform with Twilio
• The WhatsApp Business Platform with Twilio: Best Practices and FAQs