Hi i use a Samsung Galaxy Tab 10.3 (SM-T800)  to fly mi Phanton 3 Pro. For mounts y try to login on my tab and the app reset inmidiatly... when i use my phone Samsung S6 edge + work perfect. What can i do? Any one knows? Thanks for your help.

Have you tried deleting the app and reinstalling it, not sure why you can't at least log in.
The only recommended device of the Samsung Tabs is the 705c. So that could be the reason.