SMS was not delivered! results received: 23

The other message is :

SMS was not delivered! results received: 11

Thank you for contacting us, please make sure you use the key in gateway setting page, please click here if you don’t have any key.

Hello,

Yes, I use API key.
There are the codes errors from Primotexo :

https://www.primotexto.com/api/plus/code_erreurs.asp

How is it possible? I use international format +country code phone number (without 0) or local format 0 & phone number but I have always this error 11 or 23.

Please make sure the country code in the setting page is empty.