Genesyscloud_flow transfer_action 400 on AU-1 BYOC

No idea why this is happening, genesyscloud_flow resource fails with 400 Bad Request when defining transfer_action for IVR menu. Provider v1.22.0 on AU-1 BYOC.

“The transfer_action block requires a valid queue_id or skill_group_id.”

HCL is valid, queue exists in UI, but API rejects it. No useful details in error response.