The AccessMethod object (and spec.access.accessMethodRef) has been removed. How a cluster’s kubeconfig is minted is now set directly on each ClusterDefinition with spec.access — client-side module auth (the default), module-auth, hyve-agent, or primary for the host cluster. (The tunnel method, a pre-minted kubeconfig in a Secret, has been removed too — hyve-agent covers clusters with no reachable endpoint.) See Cluster Access.