Windows store certification problem

I am trying to upload app on microsoft store, but without success.

They keep saying: "App did not complete expected action.", but this is normal behavior. This is how it should work.

If I have to be more exact...This app uses client certificate to connect with remote api. But if user doesn't import certificate it cannot work, so app throws an "error" in messagebox like this: "Something went wrong. In order to proceed, please check your certificate.", with help and exit buttons.

So I have no idea what is wrong now...neather how can I solve this. It's obviously that user can not go further if he didn't install his certificate jet...