Windows wrote:
That is not valid proof of the steamid, if you don't have a screenshot then i can't do much
It is their Steam ID64. The Steam ID is STEAM_0:0:79600375 which matches the ID.
I did check it but phones and screenshots don't work together but this is the link.
steamid.io/lookup/STEAM_0:0:79600375 Did you check the logs for that? Proof of SteamID is only valid if it's from within the game - third party sites don't count.