Here's an exampleof the JWT
`{
"wid": "c13d0a99-****-****-9d76-2a644847ddde",
"rid": "d3d8c45f-****-****-bb4f-0affe770daba",
"iss": "PowerBISDK",
"ver": "0.2.0",
"aud": "https://analysis.windows.net/powerbi/api",
"wcn": "myWCN",
"type":"embed"
}`
That's all I should need to create the access token right?