Add a required chechbox for privacy policy

Hi!
Thank you for your plugin.

I need to add a required field to form: a checkbox for the acceptance of privacy policy.

I tried to add this code:

      <p class="form-row validate-required" id="rqa_privacy_row">
          <label for="rqa-privacy" class=""><?php _e( 'Accettazione privacy','yith-woocommerce-request-a-quote' ) ?>
            <abbr class="required" title="required">*</abbr>
          </label>
          <input type="checkbox" name="rqa-privacy" value"accetto">Accetto la <a href="/privacy">privacy policy</a>
        </p>

Chechbox is showed properly but now, if I click the Send your request button without filling any field, the system sends the message.

Can anyone help me to accomplish this task?

Thanks in advance