[Linux/CachyOS] Pre-ordered Minecraft Dungeons II, can’t link Microsoft.

On launch day, I couldn’t launch the game unless I used a specific configuration, and with that setup, the “Link Microsoft Account” button was available.
There’s currently an update for Linux/Steam Deck users, but the button has disappeared. I have no idea how I’m supposed to link my account and claim my capes.
Has anyone found a solution?