creating a secondary read only group with setfacl

We have created ACL's to allow two differnet groups to access some directories. You can see output from getfacl below.
group::rwx
group:rbauser:r--

The original group has full access, the secondary group has read only. However users in the secondary group can't see the directories. Think this is the first time we have done this. Has anyone any experience with this or ideas?

Thread Title is misleading, sorry, the read only group already existed, we created ACL's to give it read access

You need to add x permissions so that the directory is searchable.