Android : Android IAB testing: app in draft state but in alpha slot, cannot retrieve active product

I am testing in-app purchase functionality for my app.

The app is in alpha slot, product is active but I get errors saying "item not available" or similar when I test the functionality with release apk on real device (with gmail account in "license test response" list).

I see that the app is in draft state, is it the cause? I know draft state is not good for testing IAB but I followed the instructions about the alpha slot so I think I made no mistake.