Hi! to fix your problem you can use 3 solutions:
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You can use NavLink Actors (you can find it in your mode tab looking for Nav Link Proxy) and connect the points A and B at the start and the end of your stairs. You can use it even for make the AI jump off the ledges.
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You can edit your NavMesh parameters from Edit/ProjectSettings/Engine/Navigation Mesh. I’m not sure what parameter fix your problem, I can guess Cell Height or Agent height.
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You can fix your stairs collision to a ramp, you’d need better IK for foots bt the way so it would take more .
Have a nice day!