Thanks @Ivonne - I launched ANSYS maxwell both from workbench and standalone, and I have the same issue. I merged ansys Electronics with workbench to be able to perform magneto structural coupled simulation. so this why I thought that magnetostatic module will help me instead and it did not work too.
I used ANSYS ELECTRONICS 2021 R1 as my workbench is ANSYS 2021 R1.
I will try to use ansys 2023 instead as suggested and keep you informed.