Authentication errors when running Power Automate flows (connecting to Sharepoint)

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Authentication errors when running Power Automate flows (connecting to Sharepoint)

Mudili, Uday Kumar 0

Authentication errors when running Power Automate flows (connecting to Sharepoint) - issue from 12th Novemebr 2026 still not resolved.? any update

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Answer 1

Innocent Cyubahiro 250 Independent Advisor

Hello Uday,

Thank you for following up.

To better understand the issue and identify the appropriate next steps, could you please provide some additional details?

Error message: Open the failed flow run, select the SharePoint action that failed, and share the exact error message and status code displayed in its details.

Scope of the issue: Does this affect all flows using the SharePoint connector, or only a specific flow? Are other users experiencing the same behaviour?

How the flow is triggered: Does the error occur when you run the flow directly from Power Automate, or only when it is triggered through a SharePoint list or library?

Recent changes: Have there been any recent changes to the account credentials, MFA or Conditional Access policies, SharePoint permissions, or flow connections?

Additionally, please open Connections in Power Automate and check the status of the SharePoint connection. Does it show as connected, or does it indicate that you need to sign in again? If an authentication error is displayed, please share its details before making any changes to the connection.

This information will help determine whether the issue is specific to the SharePoint connection, the flow configuration, or the authentication process.

For reference, the following Microsoft articles may also be helpful:

Troubleshoot a cloud flow

Fix connection failures in cloud flows

Once we have these details, we can narrow down the cause and determine the appropriate troubleshooting steps.

Kind regards,

Mudili, Uday Kumar 0 Reputation points

2026-11-13T11:43:19.26+00:00

Hi, I'm facing Authentication issues since yesterday. My flows are not connecting to the SharePoint due to this issue. Tried adding new connection but still getting same error.
Innocent Cyubahiro 250 Reputation points Independent Advisor

2026-11-13T13:52:48.84+00:00

Hello Uday,

Thank you for providing these details. I understand how disruptive this is, especially when your flows can no longer connect to SharePoint.

Since you have already tried creating a new connection and are still experiencing the same error, there is no need to repeat that step for now.

There is also a relevant Microsoft service advisory, PP1550869, concerning intermittent failures affecting Power Automate flows, apps, and connectors. Microsoft reported that an upstream service issue affecting Microsoft Graph was contributing to these failures. This could be related to what you are experiencing, although I cannot confirm that it is the cause of your specific issue.

In the meantime, could you check the following?

Open Power Automate and select My flows.

Open the affected flow and review its Run history.

Select one of the failed runs and expand the SharePoint action to view the error details.

Could you please share the exact error message or error code displayed there? Also, are all your flows that use SharePoint affected, or only one particular flow?

These details will help establish whether the failure is related to the SharePoint connection itself or the wider service issue, without repeating troubleshooting steps you have already tried.

You can also refer to Microsoft's guide for identifying and troubleshooting failed cloud flows:

Troubleshoot a cloud flow – Microsoft Learn.

Thank you for your patience while this is being investigated.

Kind regards,