Using a non-WhatsApp communication method, ask the WhatsApp user to:
Confirm that they can actually send a message to your WhatsApp business phone number.
Confirm that your WhatsApp business phone number is not in their list of blocked numbers (Settings > Privacy > Blocked or Blocked contacts).
Confirm that they have accepted our latest Terms of Service (Settings > Help, or Settings > Application information will prompt them to accept the latest terms/policies if they haven't done so already)
Update to the latest version of the WhatsApp client.
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