Press Ctrl+G. That lets you go to a link, like a game or map link.
However, you still won't be able to go to a tournament link, as tournaments aren't supported in the Unity app. But you can open the individual games from a tournament just fine.
Thanks for your quick response. I do often get links to games, e.g. because someone wants to get an opinion from me. With unity there is no way to open them except for a private message. Do you think there is a way to fix that?
So you want to copy a link from chat? For that you just have to click/tap and hold a message in chat until it flashes. It will then be in your clipboard.