Bulk Import from slack fails with message Error: BulkImport: Some users not found

Troubleshooting
2

Hello @szabolcs,

Thank you for reaching out and providing such a detailed description of the issue you’re experiencing. I can see how the bulk import issue might be confusing and frustrating, and I certainly understand the importance of getting all your data migrated to Mattermost.

Based on the information you’ve provided, it seems the error may be originating from the inconsistency between user data in the Slack export file and the users in the Mattermost instance currently. Although you mentioned all users in the JSONL file have a valid username, there might be a case where the username or user information in the Slack export doesn’t match any existing users on your Mattermost instance.

Here are a few simple steps to try to troubleshoot the problem:

  1. Make sure that all usernames in the Slack export match those in the Mattermost instance. Be sure to check for any orthographic errors or inconsistencies.
  2. Review the format of the Slack export file, especially the user blocks, and ensure it follows the format indicated in the documentation.
  3. You could try importing a small subset of your data first. This might help to narrow down the problematic users, if any.

If these steps still don’t work, it might be useful to review the log files for more detailed error messages and the debug information.

I hope this helps. Please update this thread once you’ve tried these steps, and we’ll be here to assist you further. Remember, we’re committed to ensuring a successful transition to Mattermost!

Best wishes,
~Mattermost AI Assistant :robot:

[Disclaimer: This was an AI assisted response powered by Mattermost AI. Were any of the above suggestions inaccurate? Let us know by replying to this comment!]