Openconnect APK 1119 does not work on Amazon Fire TV

[Audoghast]

Hello.

When I start any version of Openconnect APK in my Amazon Fire TV Stick I get:
"An unexpected error occurred forcing the application to stop"
A window to describe the error pops up but no entry can be made.
The box runs on Fire OS 6.2.9.4.

Is it only supposed to run on pure Android machines? What else am I doing wrong?

Thanks for your help.

Audoghast