Ranger users who were synced from AD aren't mapped with Group

Hi

I'm wondering why the users are not mapped to the AD group as shown below.

These are my configurations in Ranger.

* COMMON CONFIGS

LDAP/AD URL : ldap://myADIp:389

Bind User: cn=admin,ou=ou1,dc=dc1,dc=dc2,dc=dc3

Incremental Sync: Yes

Enable LDAP STARTTLS: No

* USER CONFIGS

Username Attribute: sAMAccountName

User Object Class: user

User Search Base: ou=ou1,dc=dc1,dc=dc2,dc=dc3

User Search Filter: (empty)

User Search Scope: sub

User Group Name Attribute: memberof,ismemberof

Group User Map Sync: Yes

* GROUP CONFIGS

Group Member Attribute: member

Group Name Attribute: cn

Group Object Class: group

Group Search Base: ou=ou1,dc=dc1,dc=dc2,dc=dc3

Group Search Filter: (empty)

Enable Group Search First: No

Sync nested Groups: No

I would appreciate if you answer to me about this.

Thanks.