When using Tanzu Mission Control Self-Managed 1.3 with VMware vCenter Server 8.0 U3, workload clusters do not appear under the "Workload Clusters" section after registering the Supervisor Cluster for management.
Tanzu Mission Control Self-Managed 1.3 does not support VMware vCenter Server 8.0 U3. Support for vCenter Server 8.0 U3 was introduced in Tanzu Mission Control Self-Managed 1.4.
To resolve this issue, upgrade Tanzu Mission Control Self-Managed to version 1.4.