Yes, you will need to enroll so DailyPay can find your account with the Reward. However, you will not need to use any of DailyPay’s other services when you enroll to claim your Reward.
Remember that a Reward is a special type of bonus issued by your employer that you will get an email from DailyPay for, and normal bonuses sent by your employer will be instead sent to your direct deposit on file with work if you have not yet taken a transfer via DailyPay. If you have taken a transfer using DailyPay before, a normal bonus will either be applied against your early transfers or passed to you free of charge the next business day following receipt.