Hi, Steve. I did try rebooting the Wi-Fi a number of times along with different sequences for installing the app with no success. The troubling part is that the app is not asking you to verify the TIU under 14.6. I does ask with previous versions. I just received a notice that Apple released iOS 14.6 beta 4 this morning but I doubt that it would help this old app.
I have not seen any comments about Android devices so, I assume, that problems are limited to Apple devices. Interestingly enough I saw a Trainland/World ad for new TIU’s with built in Wi-Fi using only your smart device. Apple will, likely, release iOS 14.6 in June at which time anyone using an iPhone or iPad and allowing updates will be S O L. While their are some rumors that the software will be handled by someone absolutely nothing is being done and nothing is being confirmed. I am now down to only 4 DCS locomotives and will not touch another one until we have a clear picture of the future MTH.
