Dear Omar 9788,
Greetings!
Thanks for reaching out to this community.
Based on your description, I understand you want to change my picture In Microsoft Teams but gets the error message which says "Picture Options Are Disabled By Policy".
This error message indicates that you can't edit/change the profile picture due to your organization's policy. Please kindly reach out to your organization’s (Global) Administrator to change the picture on your behalf or verify if there are any policies in place that prevent changing profile pictures. If you are not sure who is your admin, can refer this How do I find my Microsoft 365 admin? - Microsoft Support.
For more information, please kindly refer to Change user profile photo - Microsoft 365 admin | Microsoft Learn.
Appreciate your patience and understanding and thank you for your time and cooperation. I wish you all the best!