Could someone explain the error when importing Zendesk voice calls to WFM?

Why does the WFM import job fails with INVALID_DATA_FORMAT when trying to push Zendesk ticket duration data into Genesys Cloud for adherence tracking?

“Historical interaction data must match the Genesys Cloud interaction schema exactly.”

I am mapping the Zendesk contact_duration field to the duration field in the API payload, but the system rejects it immediately. Is there a specific timestamp format or timezone offset required for the EU region that I am missing?