Unable to Install iOS Application

I’m making some updates to a client iOS app and running into an Unable to Install error when trying to test on actual hardware. I’m using Xojo 2019 R3.1 and Xcode 11.5. The iOS device is running 13.3.1 and the computer is trusted.

What am I missing?

Did you define the device udid as a trusted device in the development profile?
https://developer.apple.com/account/resources/devices/list

Xcode->window->devices and simulators-> +
while device connected.
I keep forgetting to do this and find it irritating every time I realise my mistake.

[quote=495978:@Philip Cumpston]Xcode->window->devices and simulators-> +
while device connected.
I keep forgetting to do this and find it irritating every time I realise my mistake.[/quote]
I’ve done this method many times. Xcode realizes the device is there but when I go to copy the app to it it fails.

[quote=495960:@Jeremie Leroy]Did you define the device udid as a trusted device in the development profile?
https://developer.apple.com/account/resources/devices/list[/quote]
Yes and still no joy.

Update. This is an Enterprise Certificate application. So it appears I can no longer use a standard build to test - I have to go through the entire process of applying the Enterprise Certificate to the app to load it on the iOS device. Weird but I know Apple is cracking down on Enterprise Certificate abusers. Not ideal but I can live with it.

Hey Bob we usually have to have any devices that we want to copy over apps to via xcode defined as development machines for that application.