Good morning,

This is to thank you all very much for your nice and friendly support.

Finally, with the help of a very nice online support guy, we found the solution !

What we did, uninstalled the pre installed (native) text messaging app of my phone and then installed the Samsung's text messaging app.

Probably the pre installed text messaging app was blocking text messages with the confirmation code sent by Quickbooks.

Hope this could help others with the same issue.

Best regards !