The 2021 iPad mini specification is clear in that the iPad has TouchID:
iPad mini - Technical Specifications - Apple
If purchased directly from Apple, you have a 14-day unconditional return period within which to return a device for exchange or refund. If you are disappointed or otherwise dissatisfied with your selection, you would be well advised to return your iPad whilst you have opportunity to do so.
Be aware that the 2021 iPad mini and iPad Air both feature TouchID built-in to the top button. The 2021 (and 2020) models of iPad Pro have FaceID. You can compare all models here:
iPad - Compare Models - Apple