Deploy from BAS to OnPrem fails with 403

Hi,

I am searching for days for a solution for this problem.

When I want to deploy (via command "npm run deploy") my fiori app to my netweaver backend (SAP_UI - 754 - 0006 - SAPK-75406INSAPUI) it always fails with error 403 and without any further information about the error...

In the "Service Center" in BAS I am successfully connected to the backend and I can browse through all the services of the system.

In the Cloud Connector I already granted access to "/sap/" and all sub paths to make sure there is nothing missing...

Can anybody help me?

And how can I access more information of the 403 error instead of "request failed with status code 403" ??

Thanks!