Hello Charlotte_415,
Good day. Thanks for posting in the community.
I understand that your account has been locked due to an activity that may concern Microsoft's terms and agreements. I know how frustrating this must be for you, let me help you sort this out.
The reason for this is that Microsoft possibly flagged an unusual activity on your account and for your protection, temporarily locked it to prevent any unauthorized acts.
You may refer to the following article containing information about locked accounts and steps you can take to help you regain access.
https://support.microsoft.com/en-ph/help/13956/...
To help you better and further, we highly recommended to contact our Outlook for Mac experts to get for further target suggestions, which is our dedicated support channel that will keep working on the problem with you. Open Outlook for Mac and go to Help > Contact support, as they have more resource that can better address the cause.
Contact support within Outlook for Mac - Microsoft Support
Please understand that our initial response may not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.
Thanks for choosing the MS community.
Looking forward to your response and have a great day ahead!!
Sincerely
Md Ashabul Haque | Microsoft Community Moderator