# Exploring Message Delivery Challenges on WhatsApp

Find the causes of undelivered WhatsApp messages. Whether it’s due to recipient inactivity or country-specific restrictions, learn about the prevalent issues and identify potential solutions to ensure smooth communication

When a message on WhatsApp shows as sent but hasn't been delivered, several issues could be at play. Here’s a straightforward explanation of the most common causes and some potential solutions you can attempt.

## Common Causes of Undelivered Messages

1. **The recipient hasn't been online** for the past 30 days, and messages cannot be stored longer than that period.
2. **You have been blocked** by the individual you are attempting to contact.
3. **The recipient resides in a**[ **country**](#country-limitations) where message delivery is not possible due to restrictions or sanctions.
4. **Technical issues** such as invalid request parameters, integrity errors, or the recipient has not accepted the latest Terms of Service and Privacy Policy. If it’s the latter, they should click [here](https://api.whatsapp.com/tos/20210210/) to accept the terms.
5. **Outdated WhatsApp version.** Make sure the recipient is using at least the following versions to receive messages:
   * 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
6. **The recipient is part of an** [**experiment**](https://developers.facebook.com/docs/whatsapp/cloud-api/guides/experiments)**.**
7. **To maintain a quality experience** for users, we [restrict](/whatsapp-channel/messaging-limits-and-quality-ratings.md#updated-marketing-message-restrictions-in-india) the number of marketing messages an individual can receive.

## Steps to Take If Your Message Isn't Delivered:

1. **Verify Messaging Capability:** Confirm that the recipient is able to send messages to your WhatsApp business number.
2. **Check for Blocking:** Ask them to review their blocked contacts list to see if your number is included.
3. **Terms of Service Compliance:** Ensure they have accepted the latest terms of service by guiding them to the relevant section in their app settings.
4. **App Update:** Recommend that they update WhatsApp to the newest version available.

## Country Limitations 

Due to sanctions, some countries and regions are restricted from utilizing the WhatsApp Business Platform. These restrictions include:

**Ineligible for businesses:** Businesses located in Cuba, Iran, North Korea, Syria, and specific regions of Ukraine (Crimea, Donetsk, Luhansk) cannot use the platform.

**Ineligible for users to receive messages:** Users in the aforementioned countries and regions, as well as in Turkey, cannot receive messages sent through the API. However, businesses in Turkey are still permitted to use the platform.


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