When you are logged in with cf cli v6 or v7, using an user with Space Supporter role and try to bind an app to a service you see following error.
Error unmarshalling the following into a cloud controller error: You are not authorized to perform the requested action. See section 'Space Supporter Role in V2' https://docs.cloudfoundry.org/concepts/roles.html
Product Version: 2.12
It's normal that it doesn't work with cf cli v6 since, as stated in the docs, the Space Supporter role is only available for the Cloud Controller (CC) V3 API and cf cli v6 uses V2 API.
Supporter Role is first available in TAS 2.12, since it was introduced in Cloud Controller API (CC API) Version 3.102.0. and TAS 2.12 contains CAPI 1.117.x that includes CC API 3.106.0. TAS 2.11 contains CAPI 1.109.x that includes CC API 3.99.0, hence it's not available in that TAS version.