It is now allowed to pass an Organization ID in Redirect Flow and Device Flow, so the user does not have to select the organization in Zaikio.

The organizational ID is then passed as a scope as in Client Credentials Flow. For example:
Org/5345a2a-8786-5b46-a1e2-516658fde390.directory.organization.r

It is only possible to set organizations where the current user is also the admin.