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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?
I have the same problem and so far have no hint of resolution. Dell Support indicates that it is a problem others are having. Have reinstalled three times to no avail.