Pretty much what was already said! We accept only thalassian elves (that being, high elves and void elves), whilst I assume OP seeks Highborne-Night elf related guild.
I do wish best of luck in finding one, can’t recommend any since none currently focus around Highborne RP as far as I know. Can suggest “Dirge of Teldrassil” though, if you look for night elf RP! [PCU] Worgen/Night Elf RP - Dirge of Teldrassil 🌳