We're calling GET /phone/sms/sessions with session_type=all (documented as a valid value), but some accounts return a 400 Bad Request:Error Code: 400Message: SMS session type is invalid.Questions:Under what account configurations or plan types would session_type=all be considered invalid? Is this returned when the account doesn't have SMS/MMS features licensed or activated? Is there a distinguishing error code so we can handle it gracefully in our integration?

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GET /phone/sms/sessions returns 400 "SMS session type is invalid" when using session_type=all

We're calling GET /phone/sms/sessions with session_type=all (documented as a valid value), but some accounts return a 400 Bad Request:

Error Code: 400
Message: SMS session type is invalid.

Questions:

Under what account configurations or plan types would session_type=all be considered invalid?
Is this returned when the account doesn't have SMS/MMS features licensed or activated?
Is there a distinguishing error code so we can handle it gracefully in our integration?