en_tn/jer/23/40.md

shame on you

This instance of "you" is plural and refers to the priests and false prophets. (See: rc://en/ta/man/jit/figs-you)

I will put everlasting disgrace and everlasting shame on you that will not be forgotten

"I will cover you with dishonor that will last forever and shame that you will never forget" or "I will cause people to make fun of you forever. People will never forget that you were disgraced." Yahweh speaks of the humiliation of the priests and false prophets as if he would put disgrace and shame on them like clothing.

that will not be forgotten

This can be stated in active form. Alternate translation: "that will last forever" (See: rc://en/ta/man/jit/figs-activepassive)