Twilio Gateway alphanumeric sender ID issue

Hi all,

I have an issue when i tried to use Twilio gateway with an alphanumeric sender id.
No problem if the from field is the phone number.
When i use an alphanumeric sender, sms are not sent and I’ve this error in logs : - - 2016-08-14 12:00:20 PID57b05d5401078 - L2 twilio_hook_sendsms # sent smslog_id:30 message_id: status:400 error:400|21212|The ‘From’ number test is not a valid phone number, shortcode, or alphanumeric sender ID. smsc:[twiliotest]
One precision, the alphanumeric sender id is correctly activated on Twilio side.

Thanks in advance for your help.

Anyone to help me ?
I precise this a playSMS error not au Twilio error. No logs of event on Twilio.
Thanks in advance.