Hello everyone,

My setup is as follows, I'm using a Docker container with Ubuntu 20.04 and Ros2 Foxy. I'm currently getting started with Navigation2 and I'm following the tutorial with the TB3. When I run

ros2 launch nav2bringup tb3simulation_launch.py

everything seems to be working as expected. Meaning that Gazebo loads and so does Rviz. As explained in the tutorial I make the 2D pose estimation. After which all the transforms are computed ( I also checked this with tf2tools) and sensor data starts to be show in Rviz. However, I cannot visualize the map and I get the warning "No Map received". I've been trying to figure the cause of this problem out for a while, but I can't seem to find a solution. The mapserver map_server is up and running, I checked whether it is active through ros2 lifecycle get /map_server. I also checked whether the correct yaml file is being read, by looking at the file in /tmp pointed to by ps ax | grep nav2_map_server and it is indeed correct.

Does anyone have an idea what the issues might be? Just to complete this, the /map topic does show up in the topic list, it also says that there is 1 Publisher and 3 Subscriptions. However if I try to echo or use hz it seems that nothing is being published on the topic, even though the map_server is indeed active. Am I missing something?