The solution I found for this issue is here: https://answers.unrealengine.com/questions/196214/failed-to-load-package-on-client.html
“The “Launch” button in the editor will only cook the current level that’s open and save it in the Saved/StagedBuilds directory, which could explain the travel failure. One more thing to try is using the Package Project option. This will cook all the levels in your project, and should allow the server to travel to any of them.”
I know this is probably irrelevant at this point, but I figured I’d post this for any others looking for the solution.