How would I query the members of a group in the sandbox  using the Millennium API?
I *could* do it via a bulk export of Patient resources on that group. But using the Millennium R4 API, I'm not sure how to go about it.
- Trying to GET the group itself gives a 404 (though I get a 403 with a bulk client ID).
- You can't seem to search on patients like Patient?group=xxx.
Is bulk the only way?
(My use case is that I want to get the group members, then do some further smaller R4 Millennium queries off of those members. So using a bulk client to get members, then an R4 client to do smaller queries seems slightly annoying -- to my knowledge one client ID cannot access both APIs.)