When I tried to buy 5 Cards off of the Community Market, to craft a badge, I was asked to confirm it within the mobile app. I got a notification, and then 5 confirmation prompts trickled in.
I confirmed....and steam never realised I confirmed.

Even the App kept the green dot next to the checkmark symbol, as if to say there's more, after I had already authorized all the purchases.
Waiting for minutes on end, restarting the app multiple times, even trying to buy the Cards all over again failed entirely.
I don't know if it struggles with that many prompts at once, but something definitely isn't working as intended.

Anyone else having issues with purchase authentication?