Hi,
This screen would filter only the valid Connectivity Profiles.
I see your TGW has Centralized Connectivity which is good.
Can you check your VPC Connectivity Profile has an External IP Block, an Edge Cluster and Default Outbound NAT?
Supervisor cluster need to be able to have source NAT outside for his workloads on private networks.
One common thing is that Supervisor Cluster requires services on TGW which requires in 9.0 both the TGW and the T0 in A/S.
Is that how the environment is configured.