Microsoft Graph Communications - Bot joining call - Microsoft Teams - botframework

Question

Ok. So let me try to set the stage here.
I have a Microsoft Teams Application that has a Bot (Bot Framework v4) associated with it.
I have a use case where when a specific type of compliance activity happens, I need my bot to join the scheduled meeting and participate.
I am able to send a meeting invitation to an email account associated with the bot, and the bot accepts the invite.
According to this documentation, I should be able to join the meeting in progress.
(https://learn.microsoft.com/en-us/graph/api/application-post-calls?view=graph-rest-1.0&tabs=http) - Specifically "Example 5"
According to what I am reading, once you have the required Graph Permissions on your App Id that's associated, you only need 3 pieces of information to join the call (Passed in through a communications/call/create).
Post to https://graph.microsoft.com/v1.0/communications/calls :
Body:
{
"#odata.type": "#microsoft.graph.call",
"callbackUri": "https://bot.contoso.com/callback",
"requestedModalities": [
"audio"
],
"mediaConfig": {
"#odata.type": "#microsoft.graph.serviceHostedMediaConfig",
"preFetchMedia": []
},
"chatInfo": {
"#odata.type": "#microsoft.graph.chatInfo",
"threadId": "19:meeting_XXXXXXXXXXXXXXXX#thread.v2",
"messageId": "0"
},
"meetingInfo": {
"#odata.type": "#microsoft.graph.organizerMeetingInfo",
"organizer": {
"#odata.type": "#microsoft.graph.identitySet",
"user": {
"#odata.type": "#microsoft.graph.identity",
"id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
"tenantId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
"displayName": "Drew Jenkel"
}
},
"tenantId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
"allowConversationWithoutHost": true
}
}
Upon doing this, I'm getting a 403 / Forbidden:
{
"error": {
"code": "7505",
"message": "Request authorization tenant mismatch.",
"innerError": {
"request-id": "30739bd2-37b2-4bfc-9c52-36d72a4aa54e",
"date": "2020-06-08T16:47:36"
}
}
}
Has anyone seen anything this this?