Error Message

Enabling logging for the Merge1 Microsoft Teams Importer will generate the below warning:

WARN  SenderParser - Unknown UserId found: 'unknown'. Will use 'unknown@user.microsoftteams.app' as email.

This issue can occur when the sender of a  Microsoft Teams chat is external to the organization.

This is expected behavior, however the below workarounds may be desirable. 

• Contact external users as a guest user. This is due to the fact that the Microsoft API does not allow capturing external users' events through its API's
• A Filter can be put in place to exclude messages that include address - 'unknown@user.microsoftteams.app' from reaching the target.