SMS failed to send with MIUI6

Hello everyone !
I'm using the Mac Client to send message from my Xiaomi Mi4 running MIUI 6 (Android 4.4.4).
The message failed to send on the Mac Client and I can't even see it on my phone...
Can you help me ?

Thanks in advance

Hi @Darktitor,
Would you please check if you can send SMS via web.airdroid.com?

It's working perfectly but not with the Mac Client