This is listed as a "Target Exclusives for Wallet in the Target App Section 3/4 down the list of promotions. Added screenshot of coupon details from app.
Target has a coupon for an extra 5% off purchase which stacks with the normal REDCARD discount. this is in app and has to be scanned with the wallet portion when checking out.
This is listed in the wallet tab under the "thank you" section. It is NOT targeted, appears to be available to redcard holders who have set up the mobile app.
target details below :
REDcard extra 5% Discount
Save an extra 5% off one purchase in-store with your App coupon. The standard REDcard 5% discount will be applied after the extra 5% discount. This offer is only available in the Target App and may require your REDcard to be included in your Target.com profile. One-time use only. Valid between 3/24/19-3/30/19. Not valid at Target.com. See coupon in the Target App for details and product exclusions.