Actually, the key combo is Alt and ` but if you have a US English keyboard and your distro is set to use US English then ~ is the same key and you're probably pressing the correct keys anyway. Some other Linux users had this issue. Apparently a Wayland related setting or bug is not allowing the Alt and ` key combo to be passed to the client- not the client's fault. The problem is probably related to the shortcut key settings. A while ago someone posted how to work around this issue so the client console would open but I can't find the post. The post might not exist any more. It's been a while.