Why a member cannot receive messages from others in a group call chat of Teams - microsoft-graph-api

Question

I used Create Call of Microsoft Graph API to create a group call(audio). The connection has created successfully, but every member cannot receive any chat message posted by other members.
(picture)The phenomenon that everyone cannot receive other's message
Request as below:
POST https://graph.microsoft.com/beta/app/calls
Content-Type: application/json
Authorization: Bearer <Token>
{
"#odata.type": "#microsoft.graph.call",
"callbackUri": "https://myhostname.ngrok.io/callback/calling",
"mediaConfig": {
"#odata.type": "#microsoft.graph.serviceHostedMediaConfig"
},
"source": {
"identity": {
"application": {
"id": "myCallingAppId"
}
}
},
"subject": "Test Call",
"targets": [
{
"identity": {
"user": {
"id": "User_1-Id",
"displayName": "User_1-DisplayName"
}
},
"identity": {
"user": {
"id": "User_2-Id",
"displayName": "User_2-Name"
}
}
}
],
"tenantId": "myCallingAppTenant"
}
Response:
{
"#odata.context": "https://graph.microsoft.com/beta/$metadata#communications/calls/$entity",
"id": "481f0c00-ffff-41cd-bbc8-7e21fb5e8b1b",
"state": "establishing",
"transferState": null,
"terminationReason": null,
"direction": "outgoing",
"ringingTimeoutInSeconds": null,
"subject": "Test Call",
"callbackUri": "https://myhostname.ngrok.io/callback/calling",
"requestedModalities": [],
"activeModalities": [],
"routingPolicies": [],
"tenantId": "myCallingAppTenant",
"myParticipantId": "59e11e38-87d0-4ae5-b3ce-051ea26aa34d",
"mediaState": null,
"resultInfo": null,
"answeredBy": null,
"chatInfo": null,
"meetingInfo": null,
"meetingCapability": null,
"toneInfo": null,
"incomingContext": null,
"callRoutes": [],
"source": {
"region": null,
"languageId": null,
"identity": {
"user": null,
"device": null,
"phone": null,
"application": {
"id": "myCallingAppId",
"displayName": null
}
}
},
"targets": [
{
"region": null,
"languageId": null,
"identity": {
"application": null,
"device": null,
"phone": null,
"user": {
"id": "User_1-Id",
"displayName": "User_1-DisplayName"
}
}
},
{
"region": null,
"languageId": null,
"identity": {
"application": null,
"device": null,
"phone": null,
"user": {
"id": "User_2-Id",
"displayName": "User_2-DisplayName"
}
}
}
],
"mediaConfig": {
"#odata.type": "#microsoft.graph.serviceHostedMediaConfig",
"removeFromDefaultAudioGroup": null,
"preFetchMedia": []
}
}
Is any configuration missed. How to create a calling with normal message communication. Could anyone help me, thanks!