@apero
We confirm what we wrote in our initial message, we're sorry.
@apero
No doubts, but it's the system that's designed to prevent VPN connections at boot, and we loosely suspect that it's a deliberate choice. Remember that you have very limited control on "your" Android TV device, with limited privileges. We would be glad to implement some hack to allow connection at boot; so far we did not find any, unfortunately.
Kind regards