WATI does not allow you to send a message to anyone who is not in the contact list.

You must first add them to contacts and then send them a pre-approved template message.

To add a contact, please follow these steps: https://clare-ai.zendesk.com/hc/en-us/articles/900000973543-How-to-add-a-single-contact-

To send a template message, please follow these steps: https://clare-ai.zendesk.com/hc/en-us/articles/900000974103-How-do-I-add-a-new-Broadcast-