Hello Saad.
Thank you for reaching out to the Microsoft Community.
After doing some research, we found that there is another thread open regarding the same matter. With that said, we will proceed with the closure and locking of this Forum but please rest assured we will continue looking into the situation you are experiencing now.
Kindly note that we can only keep one Thread to avoid duplicate process. Please refer to that case with the following URL: تغيير الحساب الشخصي المرتبط - Training, Certification, and Program Support (microsoft.com).
Hoping you have a good day,