# POST /iid/v1:batchAdd stops working

Calls to POST /iid/v1:batchAdd on iid.googleapis.com stop working on September 29, 2027.

On September 29, 2027, POST /iid/v1:batchAdd will be decommissioned. Calls made to this endpoint after that day will fail. The change applies to all requests to POST /iid/v1:batchAdd.

## What to use instead

Use the FCM topic subscription API instead by calling POST /v1/projects/{project}/registrations/{registration}/topicSubscriptions on fcm.googleapis.com, or upgrade to a Firebase Admin SDK release that calls it.

- API: iid.googleapis.com (iid.googleapis.com)
- Kind: Endpoint removal
- Announced: September 1, 2026
- Takes effect: September 29, 2027
- Calls after that day: fail
- Calls it hits: `POST /iid/v1:batchAdd`
- Source: [Announcement](https://firebase.google.com/docs/cloud-messaging/troubleshooting)
- Verified: October 29, 2026, against iid.googleapis.com's own pages
- Page: https://www.okapi.bot/providers/iid-googleapis-com/breaking-changes/post-iid-v1-batchadd-stops-working/

## iid.googleapis.com's words

> All the InstanceId server APIs and the device group feature are deprecated and will be decommissioned on September 29, 2027.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent