Why cant I a boosted Goblin Shaman access the t6 vendors in Caverns of Time

WoW Classic Cataclysm Classic Discussion
1

It comes up with an error message that i need to be 65 ( lvl 85 ) and have BC installed? But i have both of those things and it wont let me enter?

2

Boosted characters can’t enter old content dungeons/raids for a few days