Similar to this deal and is likely to be targeted.
I have got an email saying "We really Miss You!" offering me a free 6-inch Sub or a Wrap. Coupon appears in the 'Offers' section of the app.
I think Subway has much realised that the value of 'loyalty' is almost non-existent with their new rewards program.
Anyway, doesn't hurt to check your inboxes, or the Offers section on your Subway App to see if a Free Sub is waiting for you. Note that the validity seems to be only 1 week from the day you get the email. It is mentioned in the offer details. For me, it is 12/08/2020.