title: Could not obtain a WAC Access Token while trying to access excel file on SharePoint
body: <p>I read some of the questions that were asked pertaining to the same issue I'm having, but none of the answers helped.</p>
  <p>I am trying to read or get the cell data values of an excel file (.xlsx) stored in a SharePoint site. I've already granted the following permissions, File.Read.All and Site.Read.All.</p>
  <p>When I try to run the query below on MS Graph Explorer, I get <em>'Access Denied'</em>. I have the site-id and list-id populated in my query but not shown here.</p>
  <pre><code>https://graph.microsoft.com/v1.0/sites/{site-id}/lists/{list-id}/items/3/driveItem/workbook/worksheets/usedRange
  </code></pre>
  <p><strong>Response Preview</strong></p>
  <pre><code>{
      &quot;error&quot;: {
          &quot;code&quot;: &quot;AccessDenied&quot;,
          &quot;message&quot;: &quot;Could not obtain a WAC access token.&quot;,
          &quot;innerError&quot;: {
              &quot;date&quot;: &quot;2021-03-03T17:47:01&quot;,
              &quot;request-id&quot;: &quot;ccb9aa2e-ef69-4834-802c-f71d43ee1b78&quot;,
              &quot;client-request-id&quot;: &quot;c478...&quot;
          }
      }
  }
  </code></pre>