Anyone free to help troubleshoot this 403 Forbidden error when mapping Zendesk agent groups to Genesys Cloud Business Units via the POST /api/v2/wfm/schedules endpoint. The migration script uses the genesyscloud-python SDK v12.1.0 and fails specifically on the business_unit_id field, whereas direct Zendesk group IDs work fine in the source system. Environment is Genesys Cloud Public (EU-West) and the user has wfm:schedule:write permissions.