I noticed when you write a git link like git@github.com:EpicGames/UnrealEngine.git, the forum will auto convert it to a mail url. It shouldn’t do that for git links.
Because you missing protocol identifier so by default vbulletin thinks it’s email, i suspect that SSH (but not sure port should be in after “:”)? so it should be ssh://git@github.com:EpicGames/UnrealEngine.git or use HTTP link https://github.com/EpicGames/UnrealEngine.git it should work with git clients too
Learn little about URI ;] Uniform Resource Identifier - Wikipedia
Oh well thats really true. I missed/ignored the fact this is user@server and missing the protocol specifier is just a shortcut.