Stuck on predictive outbound campaign segment reference in AU-1 BYOC

Stuck on predictive outbound campaign deployment. Terraform plan succeeds but apply fails with 422 Unprocessable Entity on genesyscloud_predictive_outbound_campaign. Env: AU-1 BYOC, Provider 2.5.1.

The segment_ref must point to a valid, active segment ID.

The segment is active and visible in UI. JSON payload looks correct. Any known issues with segment validation in AU-1?