Power Automate Error since yesterday: Could not obtain a WAC access token..

Question

Hello all,

since yesterday I have a problem with my Microsoft Flows. Until yesterday they all worked without problems. However, since yesterday, errors are reported in all flows that access Excel Online. The error message is:

The request is prohibited by the Graph API. Error code: AccessDenied. Error message: Could not obtain a WAC access token. clientRequestId: a9083ce3-04be-4f07-9b60-bfba19d91718 serviceRequestId: 0fabc5f0-6dec-490a-b0d2-ca47b02a7dcb

Unfortunately, I have no idea what this can be due to all at once. The flows have not been changed for a while.

How can I get my flows to work again?

Thanks

Regards

Daniel

Answer 1

Hi @Daniel,

Thanks for reaching out.

I am able to replicate the same issue with the Graph API endpoint: https://graph.microsoft.com/v1.0/me/drive/root:/XXXX.xlsx:/workbook/worksheets
As a workaround, to list the worksheets use the below Graph API in sequence:

GET /me/drive/root/children

GET /me/drive/items/{id}/workbook/worksheets

For executing the above endpoint using relative path, I would recommend you to raise a support case with Microsoft Graph, a Support Engineer will be able to assist you better. You can raise support ticket from
http://aad.portal.azure.com/ or https://admin.microsoft.com/#/support/requests.

Hope this helps.

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Answer 2

Hi Daniel please refer to this recent same issue, it seems that this problem may be a temporary server-side problem, please check if it still exists in your environment.