You need to have at least 300 BLUE before you deposit and should deposit at least 100. It requires minimum activity point of 1 which you should've earned through PLAT vault or Beta vault.
https://bscscan.com/block/countdown/7433831 Vault is set and ready to go. It starts at block #7433831. Those who get in first would get more shares! Don't forget about the boost, this time each boost will give 20% bonus!