I don't see this as a viable connection. US requires you to be through the gate reader no later than T-15. This means a 31-minute, not a 46-minute connection.

In addition, you definitely need to determine whether PL booked one or two tickets. If one ticket, you will at least be rebooked. If two tickets and you miss your new itinerary on US, you are potentially SOL and, even if rebooked, you will be behind others.