I believe your Cloud Foundry user needs to be an Admin to create an org, as seen in the Cloud foundry documentation:
https://docs.cloudfoundry.org/concepts/roles.html#permissions
Can you switch to a user that has CF admin permissions?
See MindSphere Documentation “Deploying Mendix Apps to MindSphere” here:
https://developer.mindsphere.io/howto/howto-app-mendix.html
Prerequisites¶
SpaceDeveloper
mdsp:core:Developer
or mdsp:core:DeveloperAdmin