I can see from your CMS that it has not been properly installed because you shouldn’t have /web in the CMS address. When you do it causes all sorts of odd issues such as what you described.
Also to authorize a Display with a different CMS you need to make sure the correct CMS address is set under the Players settings, which you can do remotely on Android, Windows, and Linux Displays if you have installed Team Viewer on them previously. Otherwise it needs to be done manually on the players settings.