Twice tried to get on, first time 7 mins with the dovetail games sign. Quit and tried again 5 mins wait finally got on. PS4 Pro
I will qoute Dimitri from that Thread: https://forums.dovetailgames.com/threads/tees-valley-line-out-now-on-ps4.16386/page-2#post-80531 So they are on it and hopefully get it fixed soon.
https://forums.dovetailgames.com/threads/tees-valley-line-out-now-on-ps4.16386/page-2#post-80531 See Dmitri's comment at the bottom of this post