There could be issues they experienced on some distributions... AND/OR they are too lazy, don't have the resources to- , or feel too unknowledgeable to want to risk having to supporting Linux users trough steam client on a very broad array of Linux setups/distros.

(Eventhough Linux users are by far the best audience to help solve bugs and participating in giving technical feedback on issues and bug reporting....While Windows user's are actually more often than not "MAH GAME NOT WORK! WHY GAME NOT WORK! ? FUUUUUUUUU! MAKE MY GAME WORK!!!!!!")

If i remember correctly, i've experienced this problem a while back. I think it was solved by delete 1-2 files in the Steam folder. Though i can not remember which files. But i'll have a look around and see if i can find the page that helped me.

BTW: Since you have access trough Wine, issuing a "De-Authorize All Other Devices" (Settings > Account > Manage Account Security) from there, then try logging in again from Linux MIGHT be worth a try. Note: This might require reactiivating the cellphone app on you cellphone as well though.

(perhaps it can even be done by using just the phone App, which would be easier. I've not checked app settings if it's even an option there though)

Another tip, which i'm also not sure will work or have tested myself:

Try running Steam in linux terminal with the -login <[username]| [password] argument (or simply just the steam command alone might even do). That miight give you some clues trough the terminal output as to what/where things are going wrong.


(Note: remember to clear bash command history etc. aftwerwards, regardkess if it does work or not, so that there's not ever any Steam password left stored as typed cleartext:

and/or
)

What he said

I've had Overlord (1 and 2) on my steam account for several years. And i used to love this game. It kind of gave me the same wierd feeling i got from Black & White for some reason unknown to me...

Then, some years ago, after having purchased and used Windows Vista (AKA, that thing-required-to-get-DirectX 10) for a while; I switched to Linux full-time. And i never plan to go back to Windows, regardless of how many of my previously bought games i'd risk being unable to run.


http://psteamcommunity.yuanyoumao.com/games/11450/announcements/detail/928124261817146458
All hail Codemasters !