Patterns I can find:

https://prow.ci.openshift.org/view/gs/test-platform-results/logs/periodic-ci-openshift-release-master-nightly-4.20-e2e-aws-ovn-upgrade-fips/1972953469132214272

level=error msg=failed to fetch Cluster: failed to generate asset "Cluster": failed to create cluster: failed during pre-provisioning: failed to create IAM roles: failed to create IAM master role: failed to create master role: operation error IAM: CreateRole, https response error StatusCode: 409, RequestID: b0f74b33-545c-4366-9523-20872924b73c, LimitExceeded: Cannot exceed quota for RolesPerAccount: 1000

https://gcsweb-ci.apps.ci.l2s4.p1.openshiftapps.com/gcs/test-platform-results/logs/periodic-ci-openshift-release-master-nightly-4.20-e2e-aws-ovn-upgrade-fips/1972678102072954880/artifacts/e2e-aws-ovn-upgrade-fips/gather-extra/artifacts/pods/openshift-cloud-credential-operator_cloud-credential-operator-6ccfd59b75-qntp9_cloud-credential-operator.log

cloud-credential-operator.log for that job has
msg="AWS error creating user" actuator=aws cr=openshift-cloud-credential-operator/openshift-cloud-network-config-controller-aws error="AWS Error: LimitExceeded - LimitExceeded: Cannot exceed quota for UsersPerAccount: 5000