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  • The solution proposed by John Huebner to Accept Only Unique Values is working fine in the backend.

    But I made a frontend form using Elementor form and the error message of non unique value do not appear in the frontend form and also the post is saved in db even with duplicate value.

    I am using Elementor Pro, ACF Pro and the ActionsPack plugin (Save action).

    Does anyone knows a solution to this problem ?