UE4.19 Blueprints/C++: Steam cannot join session
I have a project running UE4.19 with Blueprints (primarily) and C++ (for Discord RPC). In my blueprints, I try to join a Steam session. When I Play In Editor (Standalone) or package it and run it twice, I can host a Steam session from one instance and join it from the other. However, when I package it and play it from two computers, I can find the other session, but joining it doesn't work (nothing happens). Why might this be?
Join Widget: https://blueprintue.com/blueprint/gbsuzeae/
Hosting Widget: https://blueprintue.com/blueprint/9gb8e18s/
Spawning Join Widget: https://blueprintue.com/blueprint/2ioz_zpf/
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