@janne The problem here might be that you are specifically using iOS emojis. There are several issues in the web using iOS emojis with Roboto.
I think (!) Roboto does not include the unicode conversion for every emoji.
As you can see above, Android worked at least for the more common ones. iOS might be a problem.
Maybe this emoji font family on github can help but I’m not sure how it could be implemented on a mirror.

Thanks,
That did the trick, I used laukit on the RPI3.

i can connect to both my mirrors on the 2.4.1 version

@janne Not much help in here - Though I could see this as a smart feature where a task can be divided between people. And the task will be assigned to a new person each day. If it was possible to make a file with the assigned person each night (with cron) and then MMM should only show the content of the txt-file. Then the next thing will how to create this cron entry.