Managing personal Outlook.com account settings, security, and privacy
Hi, MartinB75
Welcome to Microsoft Community.
I'm sorry to hear that you are experiencing issue with your account. I'm here to help and I'd like to provide you with some advice but I need to know more about your issue, thank you for your understanding.
You have mentioned that your account has been locked and you have alternative emails or phone, can you try to unlock your account with your alternative security information? Did you encounter any problem during your unlocking process?
If you did, you can provide me with a full screenshot with error message, never include any personal information in your screenshot if you do so. You can also wait for a few days and try to unlock your account again.
Also, you said that you are not receiving confirmation email in your other stated email address. I'd like to know what are the domain and protocol of this email account? If you are not sure you can refer to your email service provider for help, usually you can find them in support website.
With these information I can have a better understanding of your problem and we can solve it with more efficiency. Thank you for your cooperation and patience. If you have any update you can post here and let me know.
Best Regards, SchaleP-MSFT | Microsoft Community Support Specialist