CreateChannel in GraphAPI sometimes results in not creating the corresponding Sharepoint/OneDrive

sgsmittal How were you able to get the document library ID programmatically? Sometimes after a private channel is created, I can't even get the site ID of the channel, which is needed to get the document library ID.

To get the site, I'm using:

var destinationDrive = await graphClient.Sites.GetByPath($"sites/{channelSitePath}", hostname).Drive
    .Request()
    .GetAsync();

This is equivalent to the HTTP call:

GET {{baseUrl}}/{{beta}}/sites/{{hostName}}:/sites/{{privateChannelPath}}

I get the following response:

{
  "error": {
    "code": "itemNotFound",
    "message": "Requested site could not be found",
    "innerError": {
      "date": "YYYY-MM-DDTHH:MM:ss",
      "request-id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
    }
  }
}

Only after clicking the Files tab in the channel does the site get provisioned. Then I am able to get the site, similar to your experience.