This premade asks to call the customer. Turn on calling for a WhatsApp number first.
The Request a call step sends WhatsApp's call permission request, which only works on a number with WhatsApp Calling turned on.
Go to Connections and turn on calling for a number.
Then create the automation from this premade.
Still stuck? Send AVX-3406 to hello@theavoxai.com along with what you were doing when it happened.