Managing personal Outlook.com account settings, security, and privacy
That notification about your security information being changed by someone else usually indicates your account may have been hacked.
If you are now notified there is a 30 day wait period on your account, that is a security feature on Microsoft accounts to stop hackers accessing your account and there is no method available to bypass that wait time period, you will only be able to change the information on your account after that security wait time period expires.