Project privacy set to public. By default, its content is available to everyone (authenticated or not). Please note that more restrictive permissions might exist on some items.
Go to project » mediawiki » administration.
Ensure that mediawiki is in full screen in Options section.
Navigate with IE11 to the mediawiki service.
At the end of the page there is a notice that my browser is not supported. I cannot dismiss the message.
Probably linked to request #17155