As an IT consultant, I often encounter various technical issues that require a bit of digging to resolve. Recently, I came across a particularly perplexing problem: the OneDrive button in Microsoft Teams was resulting in a 404 error (page not found). This issue persisted even after resetting and reinstalling the Teams client, and it was also present when accessing Teams via the web. Thanks to Bas Pijpstra (https://www.linkedin.com/in/bas-pijpstra-4a87293b/) for helping me with this issue!
The Challenge
The 404 error is a common HTTP status code that indicates the server could not find the requested resource. In this case, it was particularly frustrating because it affected the seamless integration between Teams and OneDrive, which is crucial for file sharing and collaboration. The error not only disrupted the workflow of users but also posed a challenge for other users who rely on these tools for their daily tasks.
Initial Troubleshooting Steps
My first instinct was to reset and reinstall the Teams client, hoping that a fresh installation would resolve any underlying issues. Unfortunately, this did not fix the problem. I then tried accessing Teams via the web, only to find that the 404 error persisted there as well. This indicated that the issue was not isolated to the desktop client but was more widespread.
Digging Deeper
Determined to find a solution, I began to dig deeper into the issue. I scoured online forums, consulted with colleagues, and reviewed Microsoft’s support documentation. Despite my efforts, I couldn’t find a straightforward solution. It was clear that this was not a common problem, and I needed to think outside the box.
The Breakthrough
After extensive troubleshooting, I finally found a solution that worked. Here’s a step-by-step guide to resolving the OneDrive 404 error in Microsoft Teams:
- Request the affected user to create a 1:1 chat with another user.
- In the message box, select Actions and apps > Attach file > Upload from this device.
- Select a file you will send to the other user, then select Open.
- Press Enter to send the file or select Send.
- After you’ve sent the file, restart Teams, then navigate to the OneDrive app.
The Cause
After your User Principal Name (UPN) is changed, when you try to access the OneDrive app in Microsoft Teams, you receive the following error message: 404 File not found.
Why This Works
This workaround essentially forces Teams to re-establish its connection with OneDrive. By sending a file through a 1:1 chat, you prompt Teams to access OneDrive’s file storage capabilities, which seems to reset the connection and resolve the 404 error. It’s a simple yet effective solution that can save a lot of time and frustration.
Conclusion
Following these steps resolved the issue for me, and I hope it helps others facing the same problem. As always, if you have any questions or need further assistance, feel free to reach out. Troubleshooting can be a challenging process, but with persistence and a bit of creativity, even the most perplexing issues can be resolved. After solving the issue I found Microsoft also wrote an article about this: https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/files/404-error-access-onedrive-teams
Happy troubleshooting!