Why does GreenLight from docker not connect to BigBlueButton?

Question

BigBlueButton

The bottom line is that BigBlueButton is running on the VPS. The server is accessible from the outside and controlled by api through https://mconf.github.io/api-mate/#server=BIGBLUEBU... I
wanted to tie GreenLight. True passed all the stages indicated in the official. documentation, configured the .env file, but, as a result of checking the configuration with the command

docker run --rm --env-file .env bigbluebutton/greenlight:v2 bundle exec rake conf:check

gives a message that docker can't connect to BlueBaton.

Checking environment: Passed
Checking Connection: Failed
Error connecting to BigBlueButton server - execution expired

At the same time, the web interface is visible and works.

The connection between GreenLight and BBB does not work, despite the fact that all parameters for connection ( BIGBLUEBUTTON_ENDPOINT, BIGBLUEBUTTON_SECRET") are set correctly. Nothing changes with UFW disabled. It seems that Docker works for entry, but does not work for exit, because the ping from under the docker of the site domain did not come out.

> docker exec -ti 1d419c018029 sh
> ping [ host ]
--- [ host ] statistics ---
10 packets transmitted, 0 packets received, 100% packet loss

Tell me how to set up Docker so that he sees the BBB.

UPD. As far as I understand, the docker does not have access to the Internet.
With the --net=host option in the docker run command, everything works, but the command does not apply to running docker-compose, which runs GreenLight. What settings should I make so that docker-compose takes the Internet from the host machine?