OpenShift LDAP group sync - filter does not start with an '('

Issue

• When trying to create and sync groups and users using LDAP sync method, get this error message about parenthesis

# oadm groups sync --whitelist=whitelist.txt --sync-config=ldap.yaml --confirm
error: validation of LDAP sync config failed: groupsQuery.filter: Invalid value: "objectclass=groupofuniquenames": invalid query filter: LDAP Result Code 201 "": ldap: filter does not start with an '('
See 'oadm groups sync -h' for help and examples.

• Snippet of LDAP sync config file does not contain parentheses

groupsQuery:
        baseDN: "ou=tst1,dc=example,dc=company,dc=com"
        scope: sub
        derefAliases: never
        filter: objectclass=groupofuniquenames
        pageSize: 0