Here are a couple of other solution you can try.
In the account overview, you can find a button labeled "Sign Out Everywhere" you can click on that and it will sign everyone out of your account.
Another option you can try is in the account overview under the offline device tab, you can select which device to deregister.
If you have any more question click here to be taken to the ‘What do I do if my account has been taken over?’ support article.
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