Personal Vault on Onedrive not opening

Hello Aaron Reilly

Since Personal Vault still opens on your phone, your files should remain accessible.

On macOS, please access Personal Vault through the OneDrive website using the latest version of Microsoft Edge, Chrome, or Firefox, preferably in a Private or Incognito window.

If you normally sign in with Touch ID or a passkey, sign out of all Microsoft accounts, close the browser, and sign in again using your account password or another sign-in method. After OneDrive opens, select Personal Vault and complete its separate verification.

If the “Unknown render failure” continues, please use the mobile app for any urgent files and contact Microsoft Support, as this may require service-side investigation.

You can contact support here:
Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.  

1. Open a website link - Contact - Microsoft Support 
2. In the box below "We're here to help", type Microsoft 365, click "Get Help", and then click "Contact Support" below.  
3. In this section, you will need to sign in to your Microsoft account. 
4. Select "Microsoft 365 and Office" under Products & Services, select "Technical Support" as the category, and click to confirm 
5. You can select " Chat with a support agent in your web browser " to access the chat window. 

I hope the browser sign-in workaround restores access.

Have a nice day.