ROSA STS Cluster Creation Failure

The `periodic-ci-openshift-release-master-nightly-4.20-e2e-rosa-sts-ovn` job failed due to an error during cluster creation: "Failed to create cluster: status is 400...". The log analysis shows multiple step failures including `e2e-rosa-sts-ovn-rosa-cluster-provision` which aligns with the cluster creation failure. The error "Cannot iterate over null" suggests a problem with data processing or configuration.

*Job:* [periodic-ci-openshift-release-master-nightly-4.20-e2e-rosa-sts-ovn](https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/periodic-ci-openshift-release-master-nightly-4.20-e2e-rosa-sts-ovn)

It's recommended to investigate the cluster creation process and related configurations for this ROSA STS job.