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  • For future reference, this function is referred to here: https://www.advancedcustomfields.com/resources/acf-validate_save_post/

    It will work if you use the selector within the input name. Should be something such as acf[field_5b1e124565677].

    acf_add_validation_error( 'acf[field_5b1e124565677]', 'Required' );