I have a Windows machine (Win 10, IPv6 enabled) and I can connect to it form an old Android phone but I am not able to connect from Galaxy Z Fold 5. I am using the free version.
Relevant (according to me) log:
2023/11/21 13:16:29.661 14959-14997 W/TeamViewer CreateClassicSession::HandleRequestRouteResponse: Lock to RemoteAccessApi module instance failed. Can't set Reach state for source device!
2023/11/21 13:16:29.662 14959-15971 I/SessionManager set is connecting: false
2023/11/21 13:16:29.662 14959-15971 I/AbstractNetworkControlMethod onSessionShutdown
2023/11/21 13:16:29.662 14959-15971 E/ConnectionEventManager connection event: noRoute
2023/11/21 13:16:29.663 14959-14995 W/InterProcessGUIConnector Received SessionCommand (SessionCommand ptr=0xb400007b7175fe50 rct=4 ct=Terminate) without registered callback.