ROS1 Subscribe Action Graph Node not subscribing to topic published

I was trying to practice this tutorial and got stuck at a point where I created the omni-graph as instructed.

And then it appears that the ROS1 Subscribe Twist Node isn’t working. I got the roscore started and running and published velocity commands. And then, I also double-checked if it is getting published.

And the info about the node subscribing to the topic is attached.

And finally, the problem is that the turtlebot3 cannot be controlled by giving commands through a ROS topic.

Would appreciate any input! Many Thanks :)

The rqt_graph looks like this:

Can you describe your ROS and Isaac Sim setup? Are they both running locally? Is one of them or both of them in a docker?