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21711: Phone Number, Short Code, or Alpha Sender is not associated to the specified Messaging Service.

ERROR: 21711

ERROR

Error - 21711

Phone Number, Short Code, or Alpha Sender is not associated to the specified Messaging Service.

The phone number, short code, or alpha sender you are attempting to access is not associated to the specified Messaging Service.

Possible solutions:

Find the phone number in the Twilio Console.
Identify the Service the phone number may be associated to.