I am currently experiencing a problem with Microsoft store API (Windows.Services.Store) in Unity UWP build of the game. I have my own API built on top of Windows.Services.Store

Situation is as following:

1. Pop-up appears.
2. I press “buy now.”
3. It is showing a loading screen.
4. The pop-up becomes a blank sheet with a outlined space for some information (but without actual information).

At step 4 the only thing I can do with this pop-up is to close it by pressing on X in the top-right corner which results into the status of purchase NotPurchased.

I have figured out that the problem is in the Windows.Service.Store API. The execution is stuck in the process of awaiting RequestPurchaseAsync function.
awaited function where the execution is stuck

Buying a subscription. Image

Blank pop-up. Image

I have tried updating API, changing version of XAML, looking for similar problems in other projects on the web.