Register for Voice OTP error codes

This section lists the error codes you may encounter using the Register API.
4e00: Malformed request 4e01: Service Internal Error 4e02: Authentication failed 4e03: Authorization failed 4e04: Unsupported service protocol version 4e0b: VIP certificate revoked 4e10: This URL does not support this operation 4e0a: Token orders for this token type already fulfilled or expired 4e10: This URL does not support this operation 4e1b: Phone number has already been activated 4e21: Unable to send message to voice gateway for the given number