As the user aussieburger found out, the Join Session Blueprint node is not working for Android (maybe for more platforms). It seems that the ip address is not correctly handed over, so the problem lies more specifically at the Find Sessions node. An Android host can be joined by an Android client by executing the command “open [ip address of android device to join]”.
To reproduce this bug try to connect to an Android host with whatever client using the Find Sessions and Join Session nodes.
Workaround: avoid the join session session node by connecting to an android host with hard coded ip address using the excecute command node “open [ip address of android device to join]” like described above.
Please Epic, take care of this bug!