Show hidden field in email submission

I have a field that sometimes is shown and sometimes is hidden. I want it to show on the email submission form so we can see it, every time. Any way to do that?

https://form.jotform.com/62388791050157

It is the promo code field

If the field is filled, it should be shown in the email notification regardless of whether or not it is shown in the form.  If there is something entered in that field, it should be showing in the email even when hidden.

right. but it isnt.

I cloned your form to test it and all of the hidden fields in the form that were filled are showing in the email notification:

Under what conditions is the promo code field being hidden?  The other fields in the form that are currently hidden were included in each test I made.  Are there certain circumstances where those are not included as well?  Let us know what you can and we will be happy to have another look.

type in 25friend in promocode. It causes it to be hidden and then doesnt show up.  I would like for it to show up.

I can see what you're referring to, but this currently happens because the form is set up to clear hidden fields when the form is submitted, I would suggest you to set the form to do not clear hidden fields, to do it click on the preferences icon: 

Then go to the advanced tab and click on the show more button: 

Then set the field "Clear Hidden Field Values" to do not clear:

Once you do this the field will be included in the email notification even when it is hidden: 

Hope this helps.