Can't get ipfs-cluster-follow working in Docker

Hi, I have been using the example docker-compose file to set up a cluster. I want to follow another cluster as a peer using ipfs-cluster-follow, but it doesn’t work. When I start the peering using ipfs-cluster-follow run after having done an init, it doesn’t work. It’ll tell me that no other peers were found and it pins and downloads nothing. Not even after a long time.
I tested doing the same thing outside of docker on my desktop (I run the docker containers on a RPi) and there it works. On my desktop inside Docker it doesn’t work either, so I think it has to be an issue with the Docker setup.
Anyone in the know on what this could be?