If you requested the FREE gum from Stride on facebook make sure to check your emails. There Is a confirmation email that you need to click on the link in order for your order to be submitted. If you do not do this you will likely not get your sample.
The email is from email@example.com Titled Stride Subscription Confirmation
If it is not in your inbox check your spam box! Mine came shortly after requesting!
Here is what the mail looked like: