Hi ,
Using what suggested, I was able to get a character with a box around that that I could switch the collision on to block/unblock the navmesh. I found that the one stipulation was that it had to be a separate actor in order to update the navmesh.
So what I did was I created an Actor Blueprint that was just a box that blocked Pawn collision (The NavMesh channel). Then in the Character, I added a Child Actor Component with the Box Actor BP as the class. By disabling/enabling the Child Actor Component’s collision, I was able to block and unblock the navmesh.
Let me know if that helps.