I sent a message, the live chat is offline.
What I meant to say is, when I tried to re-register the license through the web interface the fop2 service just stopped without any error message. to understand why, I used the command line and saw the message that ask me to "revoke" the old machine (what I cannot do because It's not working anymore).
I hope they will get my message soon and reactivate my license.
Thanks for the help!