Troubleshooting
Not delivered: “This number is not on WhatsApp, or cannot receive messages right now.”
Check the number and its country code. If they are right, the person may not use WhatsApp on that number — ask them to message your click-to-chat link, or reach them another way.
Meta error codes 131026133010 · every code
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How this works in GoPromoteNow: WhatsApp error codes, explained