REST- LDAP GroupIdIn Query parameter to Authorization not returning

Has anyone tried this?
I’m trying to do a REST query call to /Authorization?groupIdIn= and I want to find the authorizations that an LDAP group has been granted. All I’m getting back is []

The groups are in DN format (Active Directory) CN=Name with spaces,OU=Folder with spaces,OU=Another Folder,DC=domain,DC=domain,DC=com

I’ve tried it with URL encoding and still nothing.

Bug maybe?