i found an unknown device under my apple ID
I just switch on my Ipad2 and a msg has appear , pls refer to the image I attach. Then i found an unknown v00509f90428b under my device..what should I do now? How to remove this? I used to receive emails said my Apple ID was signed in on an iMac few times already , after I reported to Apple personnel they only asking me to change my password...what should I do now?
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[Image Edited by Moderator to Remove Personal Information]