How to import Portal Group? And portal role assignment issue in ARM

Hi GRC Expert

Thanks for @Madhu Babu and @Alessandro Banzer 's nice help, really appreciate your guys.  I successfully imported portal roles into BRM, but I still have two issue in my follwoing  testing

1. Try to create new portal account and assign the imported role, but the MSMP workflow log says"Can not update role because: Cannot update group as member null doesn't exist". Maybe I need also import portal group, right?

2. Try to assign the imported role to existing portal account, according to the MSMP log, the assignment successed, but I checked the portal side, the role has not been assigned

Here is my last question for your reference

How to import Portal Roles which can be selected in ARM

Hope someone can give me some suggestion.

Thank you in advance

James