You may want to double check that, as far asI know, passwords set within the SEPM do not apply to Macs.
Q. There's no Add or Remove programs for Mac. How do I uninstall?
A. As of version 14, you can uninstall through the menu. Click on the shield icon, and then click Uninstall. Enter an administrative password when prompted. Since a restart is required to complete uninstallation, you should save all open work before you begin. For a managed client, if you set a password to uninstall the client (through Clients > Policies > Location-independent Policies and Settings > Settings > Password), it does not apply to Mac clients.