Stucked with Connecting... from Service Queue

Dears,

I have created a Quick Support custom module from the Teamviewer Management Console (License Premium).

I provided the link to a user which can execute it.

A session and aservice case has been created.

I can see it assigned to my user and put in the default group My Computers.

If I go to My Computers, I cannot see the computer...

If I try to connect to the session from the Service Queue (I can see he re the same Session number than the one my user has), I am stucked Connecting...

The browser I am using is Firefox. Teamviewer is not deployed on my machine. Shall I need to do it or can I connect from the web without it?

If I do not effectively need to have Teamviewer on my machine, is someone can tell me what i am doing wrong?

Thanks in advance