I have just created a new business developer account, and I have transferred all of my apps to it. That was easy. The app id's are all in my new account.
If I create a new Xcode project, I can install it on the actual device with no issues. My problem is when I try to update one of my apps that i've downloaded from the App store. I get the message "Unable to install 'appName'". I've been googling for 24 hours, trying to look into this. I found a post that stated that this isn't an issue for users when I finally get around to sending an update to the AppStore.
I have made a provisional profile for the app, and after temporarily shutting off "Automatic Code Signing" I installed it. That didn't work either. No errors, just the "Unable to install" message.(I've switched back to "Automatic Code Signing" since that wasn't the problem.)
So how do I update my app using the new developer account?