We have been attempting to integrate WhatsApp for our Periopsis company for nearly a week now, encountering the same issue repeatedly. It refuses to accept the addition of any phone number, preventing us from commencing tests with our own number and consequently hindering the integration and testing process within our app. Despite my account being designated as admin, when I attempt to verify and update permissions, it redirects me to another page indicating that the device is new, which is incorrect. I have been using this device since 2020 and have logged into Facebook from it countless times.