Any Contact information for someone who wants to provide 3rd party features for inreach?

I've been trying for literally years to contact someone helpful about providing services to Garmin Inreach users but I've been unable to find anyone at Garmin that can help.  Do I need to go through Delorme or can someone point me to a way to reach someone technical about this product?

I've tried phone support (4 times), chat support (5 times), email support (3 times), now I'm trying this forum....

Thanks!

Eric