Your body isn’t in the correct position.
A band is used to bias the position so it is felt in the glute.
Not using a piece of equipment recommended or used within the particular mwod  is like leaving out an ingredient when baking something.
Pancake analogy—what is in a pancake? (eggs, flour, water, vanilla, cinnamon,baking soda) If you remove the flour or baking soda, do you still have a pancake? No
Missing a piece of the puzzle(or ingredient) will change the result.

Looks like you identified an area that need attention.
Episode 269: On the Spot MobRx for Tight Hips
Episode 363: Pre-Squat Hip Opener Mob-Rx
Episode 252: Two Joint Muscles and Your Hips
Episode 239: Hip Extension, Like Pure Melted Gold
Episode 221: Flexion + External Rotation Hip Opener
Episode 142: Tight IT Band and Hip Flexor Fix: Runners?

Your hip could be tight from a downstream issue at your ankle.
Episode 182: Open Up Your Hips and Squat
Squat Quick Test: Is it your Ankles or Hips?