21714: Messaging Service Number Pool size limit reached

You have attempted to add a Twilio phone number, alpha sender, or short code to your Messaging Service Number Pool, but you are already at the limit of phone numbers or alpha senders. By default, a Messaging Service can contain up to a total of 400 Twilio phone numbers and short codes and only one Alpha Sender per country.

• Your Messaging Service number pool is already full (default: 400 numbers)
• You may have attempted to add more than one alpha sender for the same country to a Messaging Service or Sender Pool. Each country can only have one alpha sender assigned per Messaging Service Number Pool.

• If you are sending to the United States and Canada, use a Toll-Free or short code number with higher message throughput (MPS), instead of adding more local numbers. Most mobile carriers in the US and Canada do not not permit Application-to-Person (A2P) messaging via long codes, so there is a high risk of carrier filtering when sending this type of traffic via long code.
• If you are sending to other countries, you may be eligible to have your Number Pool size limit increased. Please submit a ticket with a description of your use case and why you need a higher number pool size limit. These requests will be reviewed by our Messaging team.