Mattermost API
POST /api/v4/teams/{id}/import endpoint removal
Stopped workingSubscribe to Mattermost APIShare
On October 1, 2026, the POST /api/v4/teams/{id}/import endpoint was removed. Calls to this endpoint now fail. The built-in Slack import API and CLI are no longer available.
Calls it hits
POST /api/v4/teams/{id}/import
What to use instead of these calls
Convert the Slack export with the mmetl tool and import it with mmctl import, which uses POST /api/v4/imports and the import job API.
In Mattermost API's words
The built-in Slack import API and CLI have been removed. The POST /teams/{team_id}/import endpoint and the mattermost import slack command are no longer available. Use the mmetl tool with mmctl import instead.
Facts
- API
- Mattermost API
*.cloud.mattermost.com - Kind
- Endpoint removal
- Announced
- October 1, 2026
- Takes effect
- October 1, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against Mattermost API's own pages
Questions
When does this change take effect?
Calls to POST /api/v4/teams/{id}/import on Mattermost API stopped working on October 1, 2026.
What happens to calls after October 1, 2026?
They have failed since October 1, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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Okapi opens the pull request with the fix before the next breaking change reaches your code.