Trying to understand the specific validation logic triggering a 409 Conflict response when assigning users to skill groups through the WFM API. We are currently deploying a workforce management synchronization module for a mid-sized client using the standard Genesys Cloud REST endpoints.
Background
Our integration is designed to synchronize employee skill assignments from an external HRIS system into Genesys Cloud. The process involves retrieving the current user list via /api/v2/users and then updating their skill group memberships using PATCH /api/v2/wfm/users/{userId}/assignments. The client has a complex skill hierarchy with approximately 500 users and 30 distinct skill groups. We are operating within the standard rate limit parameters, ensuring no more than 10 concurrent requests are processed per second to avoid throttling.
Issue
When executing the bulk update job, roughly 15% of the PATCH requests return a 409 Conflict status code. The error payload indicates: {"code": "conflict", "message": "The requested update conflicts with the current state of the resource."}. This is puzzling because we are fetching the latest user data immediately before constructing the update payload. The version header included in the request matches the version returned by the GET request. We have verified that the skill group IDs are valid and that the users are not currently in a state that prohibits modification (e.g., active in a scheduled shift).
Troubleshooting
We have implemented exponential backoff for retries, but the 409 errors persist across multiple retry attempts for the same user IDs. Logging the request and response bodies shows no discrepancy in the skill group IDs or the user status. We suspect there might be a race condition if the WFM service is processing another update for the same user concurrently, or perhaps a stricter versioning check is applied during bulk operations compared to single-user updates. Has anyone encountered similar versioning conflicts when performing bulk assignments via the WFM API? Are there specific locking mechanisms or wait times recommended between the GET and PATCH operations to ensure data consistency?