Highway incident
Delivery Delay to One-Time Passcodes & System Emails
Highway experienced a notice incident on August 15, 2026 affecting External API and Broker Web Application and 1 more component, lasting —. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- resolved Aug 15, 2026, 07:22 PM UTC
We are aware that small number of Microsoft 365 users could still be experiencing delayed delivery or delivery failures for one-time passcodes or other system emails. The underlying issue exists between Microsoft and Highway's independent, third party automated email vendor. Highway has been asked to direct users who are still experiencing this issue to submit a delisting request per the instructions provided in the error message: This can be done by sending an email with a copy of the error message, and the blocked IP address, to "[email protected]". Delisting requests can also be made via the Office 365 Anti-Spam IP Delist Portal at https://sender.office.com/ Unfortunately, the delisting requests must come from directly the intended recipient. Highway is unable to submit delisting requests on behalf of the intended recipient.