I see you haven’t had a reply for 4 days. Can you zip up your project directory, assuming there’s nothing confidential in it, and put it somewhere (Dropbox? Google Drive?) where I can download it please. I might have a board that will work!
I’ve not used Amazon’s RTOS at all, so it could be that I’m raising your hopes, but I’ll give it a try.
Oh yes, this will probably be no help to you at all: AWS FreeRTOS with PlatformIO IDE? 
as it is FreeRTOS, just not the AWS version. (Question, what’s the difference?)
Cheers,
Norm.