The process of adding a non Talkative originated number to your WhatsApp is the same process as transferring a personal WhatsApp number. In many cases, a personal number will be the likely source - however you may also obtain a number from your own telephony carrier or use an existing telephone number you use for SMS or general Telephony.
The number you obtain must be capable of receiving an SMS or Phone call to verify the number. Please note, you must be able to view the received message or listen to the phone call.
Forwarding the number to a mobile number may be a suitable way to obtain the 2FA codes, however, systems like apples AI call verifier and not compatible.
Once you have obtained your telephone number, please follow the guide here: https://support.gettalkative.com/core-features--tools/4UEXLeZKNjBk4voHYoEXsz/whatsapp-transferring-a-personal-whatsapp-number-into-your-whatsapp-business-account/6mnXKVHqTNTCfwMkwhZ9uH