I am trying to install and activate FRE 12 trial Linux in docker.

It installs but it is not able to activate. I am getting below error. There is no firewall setting.

"Could not activate license via the internet. Activation has failed."

- I use docker container.
- I use Ubuntu16.04 for docker image.

RUN ../opt/ABBYY/FREngine12/activatefre.sh --serial-number <SERIAL NUMBER> --project-id <PROJECT_ID>

Any advice on why I am not able to activate the license in docker?