"Could not contact the game client" error when trying to preview items from Gaijin Market

Since a week ago, I cannot preview items from the Gaijin Market website when I click the “View In Game” button. The error mentioned in the title above occurs through the Chrome browser in Steam’s overlay and through an external Firefox browser installed on my computer. I logged out of the Market, Gaijin Store, and my account within the game client to refresh the login tokens yet the error reappears.