Can't join RD BTCC server, "Race" is grey

I hope someone can help me out here as this is causing massive frustration on my end.
Yesterday I decided to pick up premium again to once again start clubracing here on RD, specifically I'd like to get my feet wet in the rF2 club.
But I have massive issues joining the BTCC server, I can't get the Race button to light up.
I initially had the same issue with both the ASR and GT3 servers but after googling some I found a workaround that seems to be working fine for those (mark server, click network settings, click back and voila, now I can join server), this does not work for the BTCC server though.
Any ideas?
Ports that needs to be opened in my router perhaps?
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