Dear Rawan Efara,
Thank you for your reply with useful information.
As a member of the Microsoft365 Business community, we have limited resources, therefore we cannot contact your admin or pass your message to another account. You may contact your school admin, and they will resolve this problem in a timely manner by reviewing my initial reply, please refer to How do I find my Microsoft 365 admin? - Microsoft Support. As you can see from this article, the error code 53003 indicates that you are being restricted by conditional access settings in your school, which can only be resolved by your administrator.

In case I misunderstood your query, please provide a full screenshot detailing the error you are receiving so we may provide you further suggestions.
Thank you for your cooperation and understanding.