I got mine working. It was because I had the "Dex" for my keyboard chosen. Once I changed that, I'm able to fly.
Reviews and user experience strongly indicates iOS to be the best marriage with DJI firmware. So if you want to get rid of those recurring problems Android displays will give you every now and then, invest a little more in an iOS device (eg. iPad Mini). It’s what many including myself did. And believe me, it will be worth it.
This seems to be the default answer to everything even when it's just a minor setting issue as it was in this case. I use a Galaxy Tab S3 with an MP2 and no issues at all nor any problems with my other Android devices.