If you were a user on MediaSilo who had set up MFA prior to migrating to Shift, your MFA tokens will not transfer to Shift. You will need to set up MFA specifically for Shift.
Shift uses a different authentication model than MediaSilo which allows for seamless switching between workspaces without needing to log out/back in each time or to import files across workspaces without downloading. This necessitates a new authentication method which is universal. MediaSilo MFA tokens are workspace-specific (one per login) and therefore incompatible with Shift.