Google Groups Migration: Email Not Found in Referential
Resolve mapping issues during Google Groups migration.
Error Message
Migration Log Error
Matching member ('user@domain.com') error: Email not found in referential
This error appears in migration logs when a group member cannot be matched to a target user.
User Mapping Flow
Root Cause
Missing User in Mapping List
This error occurs when a user who posted content in the source Google Group is not included in your migration mapping table. The migration engine cannot find a corresponding target email address for this source user.
Why This Happens
- • User was removed from the organization but posted in the group previously
- • External user contributed to the group
- • User was accidentally omitted from the mapping table
- • Domain name changed and old emails weren't mapped
Solution
Add User to Mapping Table
Open Mapping Configuration
Navigate to your project and access the Mapping Users section in the configuration.
Add the Missing User
Add the source email address from the error message and specify the corresponding target email address.
Source: user@olddomain.com → Target: user@newdomain.com
Restart the Migration
After adding all missing users, restart the migration process. The content will now be properly attributed.
Bulk User Mapping
Impact on Migration
What Happens If Not Fixed
Content will still migrate - Posts from unmapped users are not lost. They will be created at the destination.
However - The author information will come directly from the source email rather than being mapped to a target user. This means:
- • The post author will show the old email address
- • The author won't be linked to a user profile in the target system
- • Permission-based features may not work correctly for those posts
Prevention Tips
- • Export all group members before migration and verify mapping coverage
- • Include former employees who may have posted to groups
- • Map external users to a generic account if needed
- • Run a test migration to identify mapping gaps before full migration