Attach cloud files in Copilot fail on multiple devices with personal account

Question

Attach cloud files in Copilot fail on multiple devices with personal account

Antti Vilenius 0

Microsoft 365 Personal account OneDrive works normally and files are accessible. Copilot "Attach cloud files" fails on multiple devices with error "Something went wrong - unauthenticated". Regular file upload works. Issue persists across devices and InPrivate browser sessions.

When using school account Copilot "Attach cloud files" works on the same device.

Potentially related - on the same Personal account Microsoft Defender web portal login works but Defender application cannot sign in ("Unable to log into Microsoft Defender") on one device but can on another.

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Answer 1

Carl-L 24,985 Microsoftin ulkoinen henkilöstö Valvoja

Disclaimer: This is the forum for fi-fi locale. However, I'll support you in English since the thread is in English, if you need help using your local language, please let me know.

Hello Antti Vilenius,

Welcome to Microsoft Q&A forum.

Before we proceed, may I know if the issue appears also on the Copilot app?

I'm waiting for your reply.

Antti Vilenius 0 Mainepisteet

2026-10-23T05:03:57.1266667+00:00

Hi @Carl-L , issue applies to Windows clients on multiple devices and browsers.
Carl-L 24,985 Mainepisteet Microsoftin ulkoinen henkilöstö Valvoja

2026-10-24T14:00:00.8866667+00:00

Hello Antti Vilenius,

Thanks for replying.

Can you please check Profile > Connectors > OneDrive > Connect first and let me know the results?
Antti Vilenius 0 Mainepisteet

2026-10-25T12:51:19.4866667+00:00

Hi @Carl-L I don't apparently have that version of copilot. In Settings Sources I find these: Github, Notion, Canva, Google Calendar, Google Contacts, Gmail, Google Drive, Paypal. No Microsoft tools, OneDrive included.
Carl-L 24,985 Mainepisteet Microsoftin ulkoinen henkilöstö Valvoja

2026-10-27T13:50:49.36+00:00

Hello Antti Vilenius,

May I have a photo of it to check for you? Please remember to remove all personal information before posting.
Carl-L 24,985 Mainepisteet Microsoftin ulkoinen henkilöstö Valvoja

2026-10-28T13:37:16.0133333+00:00

Hello Antti Vilenius,

Just checking in to make sure that you have received my reply. Please let me know if you have any updates.
Antti Vilenius 0 Mainepisteet

2026-10-29T07:49:43.6466667+00:00

Hi @Carl-L , here's the screenshot
Carl-L 24,985 Mainepisteet Microsoftin ulkoinen henkilöstö Valvoja

2026-10-29T13:53:23.49+00:00

Hello Antti Vilenius,

Thanks for replying.

Can you please also check the "+" button on the chatbox, select "Use connectors" and let me know if you can see OneDrive there?
Antti Vilenius 0 Mainepisteet

2026-10-30T07:12:41.96+00:00

Same data sources can be found through the + button. Today there are a few more 3rd party sources available to choose from but no OneDrive.
Carl-L 24,985 Mainepisteet Microsoftin ulkoinen henkilöstö Valvoja

2026-10-31T10:22:15.2366667+00:00

Hello Antti Vilenius,

Thanks for replying.

In this case, it'd be better if someone can directly look at your issue to check. Unfortunately, forum moderators are unable to do so. In this case, please contact Microsoft Support. You can also send a feedback through the Feedback button on the apps.

Thank you for your understanding.
Antti Vilenius 0 Mainepisteet

2026-11-01T13:46:08.13+00:00

My M365 Personal plan was apparently updated and now attaching cloud files works. Didn't even need a reboot.