Transporter 1.3 Error

Upon attempting to load an .ipa file from our build system into Apple Transporter 1.3 (newly updated this week from 1.2.5), the following error was presented. This occurs when selecting the file to load (or drag/drop the .ipa file onto the app).

Never seen this before and it is unclear what the issue is (and why it might persist for 24 hours) or why it mentioned macOS App. This is an iOS/iPad app (not a macOS app) but the iPad app can be installed on a Mac as many iPad apps can.

I had another Mac with the 1.2.5 version of Transporter and the same file was loaded (and then uploaded to the App Store) without a hitch.

Does anyone have any idea or has seen something similar?