en_tn/dan/02/27.md

The mystery that the king has asked about ... not by astrologers

This can be stated in active form. Alternate translation: "Those who have wisdom, those who claim to speak with the dead, magicians, and astrologers cannot reveal the mystery about which the king has asked" (See: rc://en/ta/man/translate/figs-activepassive)

The mystery that the king has asked about

This phrase refers to the king's dream.