I have so far had to activate all my TellTale stuff (S&M season 1 and 2,SBCGFAP ep2) via the serial-number input because activating it via the telltale account method always fails.
I do get the current forum-threads thingie on the launcher, so it can access the internet. Any further ideas what I should check? Is there a list of requirements to get the TT activation method (which seems to be the preferred one?) to work?