Your game is not purchasable. Are you able to share what you’re trying to accomplish?
Viewing post in Can't claim my own game?
Free games are available for free, you can’t run a promotion on them since they aren’t purchasable.
If you want to grant someone ownership of the game you can generate a download key for them manually from the downloads key page.
Based on reviewing your comments section, a single account was asking for you (and many others) to change how your game is distributed so they could “claim” a copy of the game. This is against our rules so we’ve issued a warning on their account and removed the post.