You will receive this error when the phone number you are trying to register is currently active/registered for WhatsApp's business/consumer app. WhatsApp does not allow a phone number to be registered for multiple WhatsApp platforms i.e. you cannot register a phone number for WhatsApp consumer/business app and WhatsApp Business API simultaneously.
To register the number for WhatsApp business API, you will have to migrate the number from WhatsApp business/consumer app to WhatsApp business API.
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