Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may not receive One-Time Passcode (OTP) email messages for encrypted messages in Exchange Online – RESOLVED

Announcements Sourav Nandi

02/07/2025 08:55:00 AM

NHSmail Reference: INC46569425

Microsoft Reference: EX1107369

Issue Status: RESOLVED

Issue Description: Some users may not receive One-Time Passcode (OTP) email messages for encrypted messages in Exchange Online.

More info: Impact only occurs for users that have a process configured to perform a Domain Name System (DNS) check on incoming email messages.

Final Update: 02/07/2025 08:55:00 AM – Microsoft have received confirmation from a sample of affected users that impact has been remediated.

Scope of impact: Some users expecting to receive OTP email messages for encrypted email messages in Exchange Online may be impacted.

Root cause: DNS records for the domain that provides OTP email messages to encrypted messages became misconfigured, which is causing impact.