Managing personal Outlook.com account settings, security, and privacy
Hi, I'm John! I will help you with this.
Microsoft Q&A is public, and we can only provide information. It is beyond our capability to assist directly with the account or login-related issues.
Unfortunately, if the system is only giving you the option to add the new phone number, then the 30-day wait period is something you’ll need to go through. This security measure is in place to protect accounts from unauthorized access, and even Microsoft Support isn’t able to speed it up.
Can you confirm if you still have access to your Microsoft account online, or are you completely locked out right now?