When sending broadcast campaigns, some messages may fail to deliver. Here’s how to detect these errors, understand what they mean, and learn how to fix or prevent them.

How to detect them

After sending a WhatsApp broadcasting campaign, you might find that a percentage of your messages are marked as Unreached.
Click on the Report icon of the campaign. This will show you a detailed list of contacts and the status of the delivery for them.

There, you may find the Error Code next to some of the numbers in your list, explaining why the message could no be delivered.

WhatsApp Error 131026: Message Undeliverable

This error will appear as “(Error Code: 131026) Message Undeliverable” next to the user’s name.

What does it mean?

This error occurs when your message can’t be delivered to the recipient. It usually happens due to issues on the recipient’s side , not yours. The main reasons include:

• Not a WhatsApp Number. The recipient’s number is not registered on WhatsApp.
• Terms of Service Not Accepted. The user hasn’t accepted WhatsApp’s latest Terms and Privacy Policy.
• Outdated WhatsApp Version. The recipient must use these or newer versions:
  • Android: 2.21.15.15
  • iOS: 2.21.170.4
  • KaiOS: 2.2130.10
  • Web: 2.2132.6
  • SMBA/SMBI (Business App): 2.21.15.15 / 2.21.170.4

How to fix it

Although the error is on the user’s side, here are some things that might help to fix it:

• Verify the numbers on your list. Ensure the contacts you’re messaging are active WhatsApp numbers. Make sure they are written on the correct format, with the country code included at the beginning.
• Ask for a Test Message. Request users to send you a WhatsApp message to confirm they can reach you.
• Remind Users to Accept Policies. Tell users to check and accept new Terms in WhatsApp settings.
• Encourage App Updates.  Remind your contacts to update to the latest WhatsApp version.
• Monitor Error Reports. Regularly check delivery reports and filter out numbers showing repeated errors.

Error 131026 is common in WhatsApp broadcasting but can be minimized with good list management and user communication.
By taking proactive steps, you’ll ensure better message delivery and engagement.

This message was not delivered to maintain healthy ecosystem engagement

This error will appear as “This message was not delivered to maintain a healthy ecosystem engagement” or “In order to maintain a healthy ecosystem engagement the message failed to be delivered”.

The error is usually accompanied by specific codes:

• 131049 for businesses using the Cloud API.
• 1026 for businesses using the On-Premises API.

What does it mean?

If you’ve faced this issue, it’s likely due to WhatsApp’s Per-User Marketing Template Message Limits, a system designed to improve user experience by capping the number of marketing messages a person can receive within a certain time.

WhatsApp enforces this restriction to ensure users aren’t overwhelmed by excessive or irrelevant messages. When this error occurs, it means that:

1. The recipient has already received the maximum allowed marketing messages within the defined period.
2. WhatsApp has decided not to deliver your message to maintain user engagement and ecosystem health.

How to prevent this error

If you’re encountering this issue, here’s how you can adjust your approach:

• Space Out Your Marketing Messages. Avoid sending multiple marketing messages to the same user within a short timeframe. Make sure to allow time for users to engage with the first message before sending another.
• Focus on Engagement. Encourage users to respond to your messages. When a user responds, you gain the ability to send additional marketing messages within the same conversation window. Use interactive content like quick replies or buttons to prompt engagement.
• Leverage Active Conversations. When you already have an open marketing conversation with a user, focus on nurturing it. You can send follow-ups or additional messages within the same conversation window.
• Segment Your Audience. Prioritize sending messages to users who have shown previous engagement. Tailor messages to match user preferences, making them more relevant and likely to be read.

How to fix it

You can try resending the message after some time, but avoid immediate resending to prevent the error from appearing again. Instead, retry in increasing time intervals:

• • First retry: After 12 hours.
  • Second retry: After 24 hours.
  • Third retry: After 48 hours.

WhatsApp’s Per-User Marketing Template Message Limits are not barriers but tools to help businesses communicate more effectively. By understanding the reasons behind this error and implementing the best practices outlined above, you can ensure higher engagement rates, fewer delivery issues, and better customer relationships.