63024: Invalid message recipient

For WhatsApp, the message is undeliverable due to the recipient being an invalid user on WhatsApp or other Meta restrictions for WhatsApp.

For WhatsApp, reasons can include:

• Recipient phone number is not a WhatsApp enabled phone number.
• Recipient has not accepted WhatsApp's Terms of Service and Privacy Policy.
• Recipient is using an old, unsupported version of the WhatsApp client for their phone.

• Confirm with the recipient that they have accepted Meta's latest Terms of Service for WhatsApp. If they have not, then send them this link https://wa.me/tos/20210210 to accept the latest WhatsApp Terms of Service.
• Confirm with the recipient that they have an active WhatsApp phone number on the latest client version for their phone.