I am encountering an error when attempting to reply to a customer initiated message via the WhatsApp Business API. The error details are as follows: - Error Message: (OAuthException) (#33) You do not have the necessary permissions required to send messages on behalf of this WhatsApp Business Account - fbtrace_id: Ati5w_Y48EvbPuTu2zPtxg5

I have verified the following: - The app has the whatsapp_business_messaging permission. - The access token is valid and has the required permissions. - The WhatsApp Business Account and phone number are properly configured and verified. - The user roles and permissions are correctly assigned in Facebook Business Manager.

Despite this, the error persists. Please assist in troubleshooting this issue.