However, when signing into Xbox Live with the account a few days ago, it asked me to validate my password and then started asking me to provide alternate email addresses and mobile numbers, as apparently my account isn't secure enough (the password is rated as 'strong'). This has lead me to believe that there may have been further attempts to gain access to my account, or someone may still have access to it.

So for this reason, could I please request details of the account activity history?