well i got a response on my ticket so posting here the fix that worked for me ;-)It seems that the issue is caused by a connectivity problem and in order to resolve it I will ask you to try the following:
First of all make an exception/whitelist inside the anti-virus and Firewall softwares to allow either the Elder Scrolls Online: Tamriel Unlimited folder or the specific files of ESO.exe and the Bethesda.net_Launcher.exe.
Also, for windows firewall here are the steps:
1. Open the Start Menu and type in the search box in the upper right Firewall.
2. Select the Windows Firewall option.
3. On the left pane select Allow a program or feature through the Windows Firewall.
4. Add both the ESO.exe and Bethesda.net_Launcher.exe.
5. These files can be found in the C:\Program Files (x86)\Zenimax Online directory
6. And in C:\Program Files (x86)\Zenimax Online\Launcher.
7. Then click OK.
Please note: For network troubleshooting purposes, you should contact your ISP for the most accurate trouble-shooting.Nevertheless, I would advise you to try a few simple steps:
To best access The Elder Scrolls Online: Tamriel Unlimited, I would recommend configuring your router to open the following outbound ports:
-TCP / UDP Ports 24100 through 24131
-TCP / UDP Ports 24300 through 24331
-TCP / UDP Ports 24500 through 24507
• Update the firmware of your router (it is always a good step to take, as it prevents that an outdated firmware interferes on your connection).
• Try to put your modem/router far from all electrical devices and do not coil up any excess signal or power cables (to eliminate possible interference problems).