The Salesforce Technology team discovered and resolved a full service disruption for Pardot Accounts in the demo/sandbox environment (pi.demo.pardot.com). The incident started at 23:06 UTC and resolved with full service restored as of 23:15 UTC.
During the incident, Pardot users for Pardot Sandboxes were unable to use the Pardot UI however API and public marketing content was not impacted.
Please contact Support if you encounter any further issues. We sincerely regret any inconvenience you have experienced as a result of this incident.