Missing steps in Introduction to AI with Blueprints on the Unreal Learning site

I didn’t even get this far. I am stuck on the NavMesh Agents module. I followed through the steps (I think) and then the AI doesn’t move? Anything obvious I might have missed here, he seems to go through step by step which i’m finding useful but I can’t see where I might have missed anything (I’m guessing maybe something wrong with my NavMesh?