It's not a good practices to assign a scc directly to a user or serviceaccount. For example, this works, but is hard to manage:
oc adm policy add-sssc-to-user anyuid -z default
A better option is to create a RoleBinding to bind a particular scc, for example:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: bind-anyuid-scc
namespace: <namespace>
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:openshift:scc:anyuid
subjects:
- kind: ServiceAccount
name: <service account name>
namespace: <serivce account namespace>