Hi, I'll help you.
Some updates like:
Support for DAF Lift DLC
Support for Double Trailers.
They are some SCS DLCs, Truckers MP supports them but for you to operate on your profile you have to have the previous DLCs purchased in STEAM for the previous game
The DLC that contains Double Trailers: is an update of 1.28, mainly you find it in Scandinavia, which is a buying DLC.
The DAF Lift DLC: as it says its name is a DLC which is also a purchase.
Some of these Updates mainly refer to the support of Truckers MP of the news of SCS software as developers of the Euro Truck Simulator 2 or American Truck Simulator.
If your problem is with the login, check that your game is not in any beta of the game. To do this, do the following steps:
Open the steam library
Right click on the game and then click on properties
Make sure everything is right in the window. (Updates)
Now click on the window (Betas) and make sure it is selected "Quit all betas programs"
I hope it has served you and solved it, it's the way I understand it.
if this is not the solution you are looking for, I leave you the link of the support members of your language to help you with this problem.
I hope you have a good day. regards
link support members with languages: