Why did my WhatsApp message to a customer fail to send?

Three common reasons. More than 24 hours passed since the customer last replied, the number is not on WhatsApp, or Meta held a marketing message back.

• After 24 hours, send an approved template message instead of a free-form reply.
• Meta error 131026 means the number is not on WhatsApp or has not accepted the latest terms.
• Error 131049 means Meta held the message to keep the customer experience healthy. Wait at least 24 hours.
• A free-form message needs an open 24-hour window. Templates work outside it.