Mattermost-preview not serving on OSX port 8065

Followed the one-line Docker install for OSX:

docker run --name mattermost-preview -d --publish 8065:8065 mattermost/mattermost-preview

Which installed fine. Now docker ps reports:

CONTAINER ID        IMAGE                           COMMAND                  CREATED             STATUS              PORTS                              NAMES
e2bdbdedfda7        mattermost/mattermost-preview   "/bin/sh -c ./docker-"   5 minutes ago       Up 4 minutes        3306/tcp, 0.0.0.0:8065->8065/tcp   mattermost-preview

But nothing serves in browser to 127.0.0.1:8065 or 0.0.0.0:8065 or localhost:8065. Am I missing something?