There is no way to force an Apple ID to sign out of all devices. However, you can change your Apple ID password which will sign the user out of all devices that use that password.
You can also change the security questions associated with your Apple ID, which will sign out any devices that don’t have those new questions memorized.
Finally, you can contact Apple support and request that they disable your Apple ID account; this will effectively sign out all devices associated with that account. Steps to take if you want to force an Apple ID to sign out of all its associated devices:
1) Change your password by going to appleid.apple.com/password/change
2) Change your security questions.
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Why won’t it let me sign out of my Apple ID?
When you sign out of your Apple ID, it removes your iCloud and iTunes information from all of your devices. It also disables features that use your Apple ID, like FaceTime and iMessage.
If you can’t sign out of your Apple ID, it might be because you’re using an iPhone or iPad with iOS 10 or later. To sign out of your Apple ID on these devices, follow these steps:
Go to Settings > [your name] > Sign Out. Enter the password for your Apple ID and then tap Sign Out. If you don’t know the password for your Apple ID, follow these steps: Go to Settings > [your name] > Password & Security.
Source: https://www.tenorshare.net/apple-id/cant-sign-out-of-apple-id-on-iphone.html?gclid=Cj0KCQiAj4ecBhD3ARIsAM4Q_jEpzQpqADBJC5ZHWWrSRi4jMmJBluYuTI5woG4okk_7W79itao4d94aArTFEALw_wcB
How do I force my Apple ID to sign off without a password?
Unfortunately, there is no way to force your Apple ID to sign off without a password.
If you have forgotten your password, you can reset it using the instructions on this page: https://appleid.apple.com/account/rescue/resetpassword.html
If you have access to the email address and security questions associated with your Apple ID, you can reset your password by following these instructions: https://support.apple.com/en-us/HT204243
If you are unable to reset your password or if you do not have access to the email address or security questions associated with your Apple ID, then you will need to contact Apple Support for assistance.
How do I force my Mac to sign out of Apple ID?
There are a few ways to force your Mac to sign out of your Apple ID. One way is to open the Accounts pane in System Preferences and then click the Sign Out button.
Another way is to open the iCloud pane in System Preferences and then click the Sign Out button.
A third way is to open the App Store pane in System Preferences and then click the Sign Out button.
Finally, you can also sign out of your Apple ID from within macOS Recovery mode.
How do I sign out of someone else’s iCloud?
If you’re trying to sign out of iCloud on someone else’s device, there are a couple of different methods you can try.
The first thing you’ll want to do is go to Settings > iCloud. From here, scroll to the bottom and tap Sign Out.
You may be prompted for a password; if so, enter the iCloud password for the account you’re signed into. Once you’ve signed out, you should be able to sign back in with your own Apple ID and password.
However, if the device is locked with a passcode, you won’t be able to access Settings and will therefore need to factory reset the device in order to sign out of iCloud. This will erase all content and settings.
