Community Forum

Not to be pedantic, but that linked thread states:
"This thread is only to provide help on how to download the Tech Test on PlayStation."
Not for questions about the forums. But yes, there are also multiple threads about the forum. Either way:
https://account.theshow.com/techtest/info

"A private forum will be available for those who were selected to participate. The private forum will open shortly before the test servers go live on 2/22."

Confirmed, working now

Same here, haven't been able to access it as of yet. Maybe it won't go live until the 20th?

Looks like they're doing more than basic maintenance, all the servers are down (community market and actual online gameplay servers). A little warning would've been nice, lots of dropped games