Stuck on WFM API 400 when mapping Zendesk groups to GC teams

Stuck on mapping Zendesk support groups to Genesys Cloud teams during my migration sprint. The attempt to create scheduling groups fails with a 400 error, complaining about invalid shift patterns. Coming from Zendesk’s simple group assignment, the WFM granularity feels overwhelming.

“Scheduling groups must have a valid schedule template attached before adding members.”

How do I structure the initial payload to avoid this validation trap? Is there a sequence trick I’m missing?