Hello SarahFa,
Thank you for using Apple Support Communities.
We understand that you have been notified that someone has tried to use your Apple ID from different countries. If the notification is asking for your authorization for someone to access your Apple ID, then the system is working as designed. Someone is attempting to use your Apple ID, either intentionally or by mistake, and the system is asking for authorization. We assume that you denied that request and if so, they will not have been allowed access. You can always change your Apple ID password and you will want to make sure that you choose a secure one to make it more difficult to guess.
If you haven't already, you may want to consider enabling two-factor authentication for your Apple ID for that extra layer of security: Two-factor authentication for Apple ID - Apple Support
Best regards.