ldapcompare against IdM returns "Server is unwilling to perform"

Issue

• ldapsearch -L -x -h idm.example.com -p 389 -b cn=groups,cn=compat,dc=example,dc=com -s sub "(memberUid=user1)" returns the group with the specific user

dn: cn=admins,cn=groups,cn=compat,dc=exmaple,dc=com
...
memberUid: user1

• ldapcompare -x -h idm.example.com -p 389 "cn=admins,cn=groups,cn=compat,dc=exmaple,dc=com" memberUid:user1

Compare Result: Server is unwilling to perform (53)
UNDEFINED