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Fix SAP PI Mail Adapter OAuth 2.0 Authentication Failure in Microsoft 365
Question details
The user needs to resolve an OAuth 2.0 authentication failure when connecting the SAP PI mail adapter to Microsoft 365 via IMAPS.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Connecting the SAP PI system to Microsoft 365 via IMAPS using OAuth 2.0 for email processing.
- Observed behavior
- The IMAPS connection fails with the error 'unexpected login response; read 001F NO LOGIN failed' despite valid OAuth tokens, permissions, and Azure AD configurations.
Ensure you have administrator access to both your SAP PI system and the Microsoft Entra ID (Azure AD) admin center to modify application polling intervals and verify OAuth permissions.
Increase the Microsoft Application Polling Interval
Microsoft 365 may throttle requests if the polling interval is too short. Increasing it often resolves the 'NO LOGIN failed' error.
According to SAP Note 3267439, aggressive polling can trigger Microsoft's request throttling mechanisms, leading to authentication rejections even when credentials are valid.
Log into your SAP PI or PO system configuration interface.
Navigate to the Mail Adapter configuration for the affected communication channel.
Change the application polling interval to be greater than 10 minutes.
Save the new configuration and restart the communication channel to apply the changes.
Verify Azure AD and OAuth Configuration
Ensure that the Azure AD application has the correct API permissions and admin consent for IMAP access.
Check Exchange Online Authentication Policies
Strict Exchange policies might block the connection if not explicitly configured to allow OAuth for IMAP.
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Frequently Asked Questions
What does the error 'unexpected login response; read 001F NO LOGIN failed' mean?
This error typically indicates that Exchange Online actively rejected the authentication attempt. It is often caused by aggressive request throttling (polling too frequently), expired OAuth tokens, or IMAP access being disabled on the target Microsoft 365 mailbox.
Why did the SAP PI mail adapter suddenly stop working in early 2023?
Microsoft began permanently disabling Basic Authentication in Exchange Online starting late 2022 and early 2023. If your adapter or tenant was not fully and correctly migrated to OAuth 2.0 (Modern Authentication), or if throttling limits were newly enforced, the connection would fail during this timeframe.
Where can I find the SAP PI adapter logs to troubleshoot further?
SAP PI adapter logs can typically be accessed via the SAP NetWeaver Administrator (NWA) under the Log Viewer section. Filtering by the specific communication channel will display detailed OAuth handshake errors and connection rejections.
Does the IMAP protocol require specific permissions in Azure AD for OAuth?
Yes, the registered application in Azure AD must have the 'IMAP.AccessAsApp' permission granted, and a Microsoft 365 tenant administrator must grant admin consent for the application to authenticate successfully.
