It is not possible to create the same reward name for different rewards on a Stamp Card.

You must create unique reward names for each reward, so that you can identify between them on your Merchant Console, and so users can do the same on the Stamp Me App.

When setting up a reward name that matches one already created on the same Stamp Card, you will encounter a “reward name already used” error:

To address this, just make a small edit to the name that’ll help you distinguish it in the future.

In the example above, you could change "Free Juice" to "Free Join Juice" to differentiate the main reward free juice from the signup reward free juice.