1. If the OTP message is not being delivered, check the following:

• Ensure the recipient's phone number is registered as a WhatsApp number.
• Confirm that the recipient has accepted Meta's latest Terms of Service and Privacy Policy. This can be checked under Settings > Help or Settings > Application in WhatsApp.
• Make sure the recipient is using an updated version of WhatsApp. The minimum required versions are:
  • Android: 2.21.15.15
  • SMBA: 2.21.15.15
  • iOS: 2.21.170.4
  • SMBI: 2.21.170.4
  • KaiOS: 2.2130.10
  • Web: 2.2132.6

2. The OTP is being generated for Android users but not for iOS users.

Try these steps:

• Test the OTP message on another iOS device with a different valid WhatsApp phone number.
• Check if the recipient’s phone number is still linked to their WhatsApp Account.

3. I have a valid WhatsApp phone number and the latest app version, but OTP messages are still not received.

• WhatsApp applies Per-User Marketing Template Message Limits, which restrict the number of marketing messages a recipient can receive from businesses within a specific time frame.
• Meta controls the message delivery process to ensure high-quality user experiences. Zoho Forms does not have control over these limitations.

4. What should I do if I’ve checked everything and the issue persists?

• Attempt OTP verification again after ensuring all the above conditions are met.
• If messages still fail to deliver, reach out to Meta Support for further assistance.