If you selected to sign out of the devices that were signed in with your Apple ID, you will have to sign back in with your new password. Your Apple ID and password is used for any of the Apple services you are using. See also: How To Remove A Device From Your Apple ID Device List After you Change your Apple ID Password Note: signing out of your devices will turn off Find My on those devices, so if you have a lost device, do not sign out of that device. If you believe someone else is using your Apple ID and password, you can check the box next to Sign out of devices and websites using my Apple ID.
