Have your Apple AirPods Pro ear tips broken? This issue might be quite common.

If the original silicone ear tips from Apple have broken, it's typical to find a piece of them still attached to the headphones, which you'll need to remove before replacing them with new ear tips. See the picture below showing the white plastic part that requires removal.

Have the ear pads on your Apple AirPods Pro broken? Then you may need to remove this.