The problem seems to be rooted in that you haven't given enough data for OrganizationName
entity to even be detected on its own, so detecting it in a composite entity should fail too.
Create an intent with enough utterances with entities that can stand on their own
- Below I've quickly just made a
JoinClub
intent, and provided at least 15 utterances for the intent.
- Turned on prebuilt
geographyV2
entity
- Created a simple entity,
Organization
to gather name of the organization

Then after training, you can see in the Test panel that LUIS's machine-learning was able to pick up the Organization
entity:

Bundle related entities together with a composite entity
- I created a
Club
entity with 2 children: Organization
and geographyV2
Make sure to label the utterances in the intent with the new composite entity.
Upon testing, again we prosper! The entities are properly grouped as the Club
composite entity, while the children are also correctly extracted as well:

For additional information about how properly build your LUIS apps so that entities properly extract, see my previous two responses on StackOverflow: