Steam Tsw 2020 Lost Connection Mastery Error

Hi! I started playing TSW 2020 (I know there are more recent and better games, I just wanted to complete a legacy mastery) and I ran into a problem that when I start the game I see an error message.



At the same time, I can see my mastery progress on the site, and I even made Tier 1! However, I can't get the reward. By the way, what is this reward?

 

I also have the same problem. I login and then it says that I have lost connection and want to complete the mastery challenge for the East Coastway, but now i can't because of this.

 

As far as I remember, there wasn't a mastery in TSW 2020, masteries for tsw 2020 routes (S2L,ECW,HRR, RRO, RSN, SFJ...) were later added by the preservation crew, when back then, they fitted these routes for TSW2...