trying to create a Sales assistant card using new Custome sales insight feature but when at the end getting bad request error .
i have created the card from blank on create of account creating sales assistant card also tried from below got same issue 
https://docs.microsoft.com/en-us/dynamics365/ai/sales/assistant-tutorial1
{
 "error": {
 "code": 502,
 "source": "india-001.azure-apim.net",
 "clientRequestId": "6434a709-f072-41d9-89ad-7a6065c8e936",
 "message": "The response is not in a JSON format.",
 "innerError": "Cannot read server response."
 }