... and an Apple Account with an SMS-verified telephone number.
And of course by requesting a result, you're letting Apple know that your Apple Account cares about a particular Airtag.
All the FindMy anonymity claims go out the window as soon as you actually lose something and want to find it. It's only anonymous if you don't query the network.
Actual Airtags rotate their keys on a daily basis (when in lost mode), and Apple can't predict those keys. Theoretically they could tell that you're looking for a tag reported by devices x y and z, but the actual locations are encrypted.
