How to fix Error: UEngine::BroadcastNetworkFailure: FailureType = OutdatedClient

Development Programming & Scripting Multiplayer & Networking
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I have a super basic BP that simply creates a session and another BP that searches for available sessions and lets the player join. I’m using the Steam subsystem, and I’m not using the advanced sessions plugin or anything like that. It’s out of the box stuff

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I’ve built my game and downloaded it on two different computers. On both devices, I’m logged into Steam (using separate accounts). On the first machine, I start the game, host a server, and start playing. On the second machine, I search for a game, see the game in the list, and try to join. At this point the game restarts and I get:

[2022.04.05-05.20.43:214][986]LogNet: UPendingNetGame::SendInitialJoin: Sending hello. [UNetConnection] RemoteAddr: 76561199257225874:7777, Name: SteamNetConnection_2147482347, Driver: PendingNetDriver SteamNetDriver_2147482348, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2022.04.05-05.20.43:303][ 12]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = OutdatedClient, ErrorString = The match you are trying to join is running an incompatible version of the game.  Please try upgrading your game version., Driver = PendingNetDriver SteamNetDriver_2147482348
[2022.04.05-05.20.43:303][ 12]LogNet: Warning: Network Failure: PendingNetDriver[OutdatedClient]: The match you are trying to join is running an incompatible version of the game.  Please try upgrading your game version.
[2022.04.05-05.20.43:303][ 12]LogNet: NetworkFailure: OutdatedClient, Error: 'The match you are trying to join is running an incompatible version of the game.  Please try upgrading your game version.'

I’m using the exact same build between the two devices, both of which are on Windows 11. Any ideas?

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did you solved this ?

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It came down to user error. I’m using the Steam ID of 480 and was actually trying to join someone else’s game, when I thought it was my own server. I had failed to successfully start a server on the computer I was attempting to host from, and hadn’t realized it

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