Bad Gateway Error - when posting a message in teams

[JuneLi]

Not knowing why some of the flows will fail but some will succeed? But they are in the same setting.

To post a message 

[JuneLi]

This is the complete error message.

{

    "statusCode": 502,

    "headers": {

        "Pragma": "no-cache",

        "x-ms-request-id": "westus:8821befd-f9ed-4665-94cc-e9b2ba349869",

        "x-ms-correlation-request-id": "8821befd-f9ed-4665-94cc-e9b2ba349869",

        "x-ms-flow-mobile-ios-version": "1.3.0",

        "x-ms-flow-routing-request-id": "WESTUS:20220414T055021Z:8821befd-f9ed-4665-94cc-e9b2ba349869",

        "Strict-Transport-Security": "max-age=31536000; includeSubDomains",

        "X-Content-Type-Options": "nosniff",

        "Timing-Allow-Origin": "*",

        "x-ms-apihub-cached-response": "true",

        "x-ms-apihub-obo": "true",

        "Cache-Control": "no-cache",

        "Date": "Thu, 14 Apr 2022 05:50:21 GMT",

        "Content-Length": "688",

        "Content-Type": "application/json",

        "Expires": "-1"

    },

    "body": {

        "error": {

            "code": 502,

            "source": "flow-apim-msmanaged-na-centralus-01.azure-apim.net",

            "clientRequestId": "04af58b1-be70-41f6-9e40-17fbfb3e238a",

            "message": "BadGateway",

            "innerError": {

                "error": {

                    "code": "InternalServerError",

                    "message": "Http request failed with unhandled exception of type 'ProcessSimpleDataException' and message: 'Failed to find the user conversation id with error {\"error\":{\"code\":\"ServiceError\",\"message\":\"Internal server error\"}} for tenantId 70115954-0ccd-45f0-87bd-03b2a3587569, userId 8:orgid:82f9a961-d8a8-4a68-bcdd-3b25c0be03b6, region amer, statusCode BadGateway.'."

                }

            }

        }

    }

}