How to send ULong with an event?

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Hello,

I'm trying to send a ulong type over the network as an event, this is an event called when the player enters a room and the ulong is the users SteamID.

I get the error of a custom unknown type found, what would be a good way to send this over the network? It will only be sent 2 time - for the on join / leave room function calls.

Thanks for any help!

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