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The required option for radio button selection is not working. Pleas see my post in the CC6 How To #383294.

As a workaround until it gets updated, you can try adding in the requirement yourself in a custom Javascript view.
​

jQuery(document).ready(function() {
    jQuery(".ui.form").form("add rule", "field_name", ['required']);
});

​
​
https://semantic-ui.com/behaviors/form.html#/examples