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Channel Sandbox can only send messages to phone numbers that have joined the Sandbox



ERROR: 63015

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PROGRAMMABLE SMS
ERROR

Channel Sandbox can only send messages to phone numbers that have joined the Sandbox

Possible Causes

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This message failed to be delivered to the user because it was sent from a Sandbox to a phone number that has not joined your Sandbox

Instruct the recipient to join your Sandbox by sending the join phrase or keyword shown on the Sandbox page in your Twilio Console.


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