I have tried 'organization = empty' but this is not picking up the link of Organization Details linked to the Customer. This seems to only report on an Organization if the customer has already been associated with an Org prior to the ticket being created.

I use:
"reporter in organizationMembers(Company_A)"
which is great, but I need to find all users who have not been associated with an organization and there doesn't seem to be an option to search for those who are not associated with an Org.
e.g. reporter in organizationMembers(EMPTY)
Does anyone know of a way to do this?