Launch RVIZ with a pre-defined configuration file doesnt show the map

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I've been working on the navigation 2 tutorials. I'm currently on the navigation with a physical turtlebot tutorial. Instead of the physical turtlebot, i've been using gazebo and simulating it.

This is the next step given in the tutorial but it doesnt work at all. "Now, you should see a shadow of Turtlebot 3 robot model in the center of the plot in Rviz. Click on the Start button (Bottom Left) if you set the auto_start parameter to false. Then, the map should appear in RViz."

I tried manually adding the map but that also doesnt seem to work since /map isnt on the dropdown topic list.

I'm using ros2 Foxy