If an item or device is connected to another Apple ID - Apple Support
Identify your AirPods - Apple Support
In der Apple-ID-Geräteliste suchen, auf welchen Geräten du angemeldet bist - Apple Support (DE)
I've had these AirPods Pro's for almost 2 years now. Purchased new. Then today it randomly gave me this message when I reconnected it to my iPhone.. that is not my Apple
Apple ID のデバイスリストを調べ、Apple ID でサインインしているデバイスを確認する - Apple サポート (日本)
AirPodsをメルカリやヤフオクで売るとき、忘れるとマズい「ひも付け解除」 - PHILE WEB