Why is some of my recipients not receiving the WhatsApp OTP message?

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.

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