Which store did you buy it from? Are they giving you Steam keys explicitly or maybe the ones you recently bought were for the standalone version by accident?
- The keys were just for Steam. The store support service checked them and stated that they are definitely workers and exactly for Steam ...

So why would you come here for help? Is Matrix affiliated with this "store"?
- Because Steam sent in support of the developer. I don’t know if Matrix is ​​connected with those shops where I bought - I’ve been buying from discount for several years, there were no problems. Now they told me how to ...

No, I bought in stores in which I have already been buying for many years, there were never any problems.

Hello.
I bought a game in retail, activated and installed in Steam. I also bought a few DLC. When trying to activate, a message comes out that they need a game. Sellers assure that the keys are correct. I believe them because the shops are good, I have been using it for a long time. Tell me, please ...