Haw cant to use whatsapp numer which i paid in manychat for my professional Ig profile

Hi, community!

I need to verify a WhatsApp number on my professional IG to create an ad with the objective of receiving WhatsApp messages. The problem I have is that I paid for a number on ManyChat, and when I send the confirmation code, the live chat doesn't receive this message. What can I do?

Thanks!