American Express plans to re-launch its Universal Windows Platform (UWP) app for Windows 10 at some point this week. The company made the announcement on Twitter, though did not provide a specific date for the app's return to the Windows Store.
From American Express:
@lloydwem It should be back by the end of this week. ^E— American Express (@AmericanExpress) July 12, 2016
The company launched its rebranded American Express app in the Windows Store back in December 2015, offering a completely native experience on Windows phones for the first time. The app was pulled late last month due to malfunctions.
Thanks to Lloyd for the tip!