When deploying VS mar files via API Rest Invoke with invalid authorization headers getting 200 OK with empty response body and VS is not deployed. As seen 200 OK either VS should be deployed if not an error should be shown in the response body.
In DevTest 10.3, error messages are not shown in the response body.
If anyone facing similar issue in DevTest 10.3, support might have a patch for the issue. Please open a support ticket and refer DE395757.