Apple ID logged into multiple devices
How to log out of an old device that’s logged into Apple ID and other accounts
iPhone 11, iOS 15
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How to do this on your iPhone?
- Tap Settings, tap your name, then tap Media & Purchases.
- Tap View Account. You might be asked to sign in.
- Scroll down, then tap Remove This Device.
See this link for further reference View and remove your devices that are associated with Apple ID purchases - Apple Support
Also you can go to settings>your name, and see the list of devices under your name tap the device you want to remove, then tick remove