I’m developing a bot with a tab for MS Teams. I can upload and install it successfully.

Problem 1:
I don’t receive any event notifications on my messaging endpoint during install/uninstall. I install the bot to Teams using manual upload with ngrok tunnel. The messaging endpoint is working correctly, I receive other requests to this endpoint except POST notification on install/uninstall.

Problem 2:
I try to get a conversatoin Id to send proactive messages to the General channel using this endpoint https://smba.trafficmanager.net/teams/v3/conversations. But I always get this error:

{
    "error": {
        "code": "BotNotInConversationRoster",
        "message": "The bot is not part of the conversation roster."
    }
}

This is my request to https://smba.trafficmanager.net/teams/v3/conversations (sending it from Postman):

{
    "activity": {
        
        "type": "message",
        "text": "Hi!"
    },
    "bot": {
        
        "id": "{{APPLICATION_ID}}",
        "name": "App Name"

    },
    "channelData": {
        "channel": {
            "id": "{{CHANNEL_ID}}"
        }
    },
    "isGroup": true,
    "tenantId": "{{TENANT_ID}}"
}