Ameet,
I apologize that I did not follow up sooner. We ended up implementing several corrections that collectively resolved this issue for us. I refer you to these Notes:
1864399
1886411
1834288
1841547
1922153
Just FYI, we are still having issues with multi-user requests, specifically for provisioning portal access. But at least the multi user user group requests provision correctly. They can only be done via import file using the template format, no manual entry of the user IDs works.
Good luck!
Gretchen