Resolved
Our Engineers have confirmed that the upstream provider has resolved the issue and this impact end time would be 00:27 UTC. This incident has been resolved.
Update
Engineers have confirmed that the DNS propagation delay recovered at 12:30 UTC and will continue to monitor.
Issue
Engineers identified an issue with an upstream DNS provider starting around 22:49 UTC impacting DNS propagation delays in Common Runtime and Private Spaces. Customers may see delays in any DNS actions including creating/deleting apps, adding/removing custom domains, or accessing Review Apps