21606: 'From' number is not a valid message-capable Twilio number for this account

You can send SMS messages only from a sender that your account can use for messaging. Valid senders include an SMS-capable Twilio phone number, a Twilio-hosted or ported number after provisioning completes, a supported Alphanumeric Sender ID, or a short code. If you send from a short code, the destination must be in the same country as that short code.

• The From value is not a Twilio sender on the account or subaccount that made the API request.
• The sender is not SMS-capable, or its porting or hosting process is not complete yet.
• The From phone number is not formatted in E.164.
• The sender is a short code and the To number is in a different country.
• The sender is an Alphanumeric Sender ID for a country that does not support it, or for a country that requires preregistration that is not complete.
• You are using test credentials and a live From number instead of a supported test number.

• Confirm in Console that the sender belongs to the same account or subaccount whose credentials you used, and that the sender has SMS capability.
• Format the From phone number in E.164, for example +14155552671.
• If you use a short code, send only to recipients in the same country as that short code.
• If you use an Alphanumeric Sender ID, send only to supported countries and complete sender registration where required.
• If you recently ported or hosted the number, wait until Twilio finishes provisioning the sender before you send messages from it.
• If you test the Messages API with test credentials, use +15005550006 as the From number.

• Phone Numbers
• Alphanumeric Sender ID
• Test Credentials