PowerBI Rest API: BindToGatewayInGroup return Forbidden

[MylenePBI]

Hello,

I use PowerBI rest API to copy a dataset from one workspace to another workspace.

The datasources of this dataset are from a custom connector installed on a gateway.

I use a service principal to perform all operations.

When I try to refresh my dataset, I can't, because I have an error message saying that the extension is not activated on the gateway.

When I try "GetGatewayDatasourcesInGroup", I have an error "Not found". "GetDatasourcesIngroup" returns an empty list. So I've tried "BindToGatewayInGroup", but I have a message "forbidden". 

My service principal has admin rights on the workspace, dataset, gateway, datasources. It has dataset.ReadAll, dataset.RealWriteAll, gateway.ReadAll and gateway.ReadWriteAll rights.

In the service, when I go to the workspace created, and choose "Take control", I can see the gateway and bind the datasources.

Any idea of what's happening, and how to fix it?