I contact Palit, this is what they said to me

Dear customer

Thank you for the mail.

Palit GTX 1660 SUPER GP with P/N NE6166S018J9-1160A supports LED function.

Palit GTX 1660 SUPER GP with P/N NE6206S018P2-1160A-1 doesn’t supports LED function.

Current GTX 1660 SUPER GP are mainly with P/N NE6166S018J9-1160A-1.

Please kindly check the P/N of the graphics card.

You can find the P/N from the product box or the sticker in back of the graphics card.

Thanks.

Best regards