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HALO: Spartan Assault. Purchase problem

OP DiFF7Skyns

When I click on "BUY CREDITS" and select the amount I want to buy, the game opens a window, so I can insert my Microsoft password. After that, I aprove the code of two-step verification, on my phone. Everything is ok until this part. But the game opens the Xbox App, instead of the confirmation of the purchase. What's happening?
Can you try reinstalling the game app?