Hi Richard,
The most probable cause of this is that you created a modeler environment, not a cloud slot environment. You can select ‘Modeler Environment Yes/No’ upon creation of a new environment, but can't change it afterwards. If you don't see the option and are only able to create modeler environments, then you don’t have the right (node) permissions in Sprintr. In that case, somebody who does should either create the environments for you (cloud slot environments are visible for everyone), or grant you the node permissions.
Best regards,
Joris