Dear greg swaysland
Thanks for raising your concerns in Microsoft Community.
We understand that you are having trouble accessing your Personal Vault in OneDrive. I understand how you feel and this is indeed a troubling issue.
We have received feedback from some users that the issue has been fixed and can be accessed normally, so we recommend that you try opening the Personal Vault again in OneDrive.com to see if it can be opened successfully.
Whether the issue is resolved or still exists, please reply to share your experience with us and help us understand the latest progress of this issue.
I hope this is helpful to you and don't hesitate to ask any questions. Your understanding and patience will be greatly appreciated.
Best Regards,
Tracy - MSFT | Microsoft Community Support Specialist