MR app deploy but can't start - hangs on loading symbol

Hello,

I am porting an app from the Hololens to the MR devices. in order to remove as many issues as possible I am trying with a project that is just the MR toolkit in unity version 2017.2.0f3 MRTP. this app will build, deploy, and show up on the MR portal but will not get past the loading icon when I try to launch the app. I have tried launching the app in debug mode, but the error seems to be in the UnityPlayer.dll and is having an error while trying to initialize a char pointer (Screenshot by Lightshot). I’m not really sure what this means or how to fix it, so any assistance is appreciated.

to add some additional information, I am using IL2CPP backend and need to use that for this app. I have seen some others in the MRTP version thread say they have had issues with that, but i’m not sure if it relates to me since I can build and deploy successfully.