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LyKhanh16 Said:
"There was a Mac, which is not mine, logged in to my ID apple. What should I do to protect my account?"
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Perform the Following:
A. First, Consider Modifying your Credentials:
I would most certainly open a new eMail Address, and assigning it to your Apple ID. You'd use that eMail address when logging into your Apple Account, including on these forums.
- Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
- Associate: a different method of payment to your account
- Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option
B. Disassociate this Device:
What you need to to is remove this from you list of trusted devices.
Go Here: View and Remove your Associated Devices for Purchases - Apple Support
Also...
C. Use the Link Atop this Post: Check your Apple ID Device List to See where you're Signed in - Apple Support