Docker & Leanft: running container has no valid license, or license communication error

[luks]

I have Windows 10 Pro on host machine, where I installed Docker for windows. Since leanft provides all images for linux, consequently I switched to Linux Containers mode. Also we have proxy option enabled, so have configured it in Docker Settings to use correct proxy.  I have concurrent licence is running on another server 192.168.80.185. When I run:

docker run -it -p 5095:5095 -p 5900:5900 --add-host=license-server:192.168.80.185 functionaltesting/leanft-chrome

I get next: "Error: -122 No valid license is installed, or license communication error" 

P.S. See the attached screenshot.

Please, advice what should I check and modify to handle this error ?