Error deploying semantic model with FabricPS-PBIP - Import from JSON supported for V3 models only

Hi iscr ,

Thank you for reaching out to the Microsoft Fabric Community Forum. 

This error is not related to your connection or model complexity. It indicates that the Fabric Items API now only accepts JSON imports for V3 semantic models, and the PBIP saved with the latest Power BI Desktop build is being treated as incompatible during import. This appears to be a recent behavior change/regression rather than a configuration issue.

As a workaround, try re-saving the PBIP using an earlier Power BI Desktop version where deployments were working, or deploy the report without importing the semantic model and bind it to an existing dataset. If the issue persists, raising a Microsoft support ticket would be appropriate, as this is likely service-side.

For raising support ticket please follow the link : Power BI and Fabric support overview - Power BI | Microsoft Learn

Thank you.