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Access to Sharepoint using Microsoft Graph API from Dynamics CRM Custom Workflow Activity

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Posted on by Irzana

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I'm trying to read files from SharePoint folder using the Microsoft Graph API inside Custom Workflow activity Dynamics CRM online, getting below error when trying to get SiteId, Unable to create an instance of type Microsoft.Graph.ItemReference

Code:
public string GetSiteId()
{
    var rootSite = _graphClient.Sites[$"{_rootSiteUrl}"];
    var siteResult = rootSite.Request().GetAsync();
    if (siteResult != null)
        return siteResult.Result.Id;
    return string.Empty;
}

Please refer to the attached for error details.

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Hamza H 1,826 Super User 2026 Season 1 on at

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The error "Unable to create an instance of type Microsoft.Graph.ItemReference" usually happens because the SDK expects a fully qualified identifier or the format is incorrect.
For getting SiteId from a URL, use this approach instead:
var site = await _graphClient.Sites .GetByPath(_rootSiteUrl, "root") .Request() .GetAsync(); return site.Id;

Or if you have the hostname and site path separately:
var site = await _graphClient.Sites["{hostname}:/sites/{site-path}"] .Request() .GetAsync(); return site.Id;

Make sure _rootSiteUrl only contains the relative path or the hostname correctly.
Also, ensure async calls are awaited properly, don’t mix .Result with async.

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