when adding Ad member to an external Group in ipa server get validation error in file
 

when adding Ad member to an external Grouop in ipa server get validation error in file /var/log/httpd/error_log

information ipa server: hostname: ipasrv.l.info.net
user admin ipa:admin
ip:10.30.160.19

info AD Server : hostname: control-bkdc.info.net
user Admin: linux
ip:10.30.160.10

output error in command: ipa group-add-member ad_users_external --external "info.net\Domain Users" ipa: ERROR: invalid Gettext('external member', domain='ipa', localedir=None): values are not recognized as valid SIDs from trusted domain

ouput error in file /var/log/httpd/error_log find error message

[error] ipa: INFO: admin@L.INFO.NET: group_add_member(u'ad_users_external', ipaexternalmember=(u'info.net\\\Domain Users',), all=false, raw=false, version=u'2.49', no_members=false) ValidationError