Sidebar on anonymously shared docs not shown in IE/Edge

I created a .md file, started the chat and shared it anonymously (i.e. just the link) with other users without having an account of our nextcloud. If they open the link, they get the file and the sidbar with the chat. That works fine for all browsers, but not with IE and Edge! Is there any workaround or fix for this? I’m not an Admin but just a user.