The Master's Vault is not launching the world map (or allowing any map to be seen) for players

Following the PDF instructions and the table should launch with the Merriam Vale world map for players joined in, but it's not. Done everything known to figure out this test module (to learn D&D 5E), and can't even do it. I'm the GM, the player is in fine and can see character sheets and anything else I reveal, but no page, no map, nothing. The fog of war on or off changes nothing. All they see is the "Welcome to the Master's Vault, tell your GM to do this..." page. Nothing else can be revealed even with the proper layer (Objects and Tokens is default for all players) shown. What's wrong? The tutorial and PDF aren't sufficient to help us figure this out.

Have you moved the player ribbon? By default, the player ribbon is located on the start page and not Merriam Vale world map. I will let the Devs know about this so it can be cleared up.