Hey Everyone,
Leaving this here in-case there is someone like me who was having this issue without moving updatesets between instances.
I had to go to SNOW support to get this solution and my issue turned out to be with a disabled function I was working on, this was deactivated at the function level, but the input was still active, within this input I had incorrectly selected an "input type" of "choice" instead of "reference" and since this was referencing the sys_users table it was trying to load this reference into an input type of choice.
Spoke to the tech about this because I wouldn't have thought this would bring down the whole app but his best gucess is that the mobile app on launch loads all the active info from all the functions, inputs etc. even if they are not visible or accessible to the end user causing the app to boot incorrectly.
So long story short if you are seeing this issue check all your functions carefully as an incorrect input type can cause the whole app to lock up even if it isn't available within the navigation.
