Microsoft 365 Login Issues

Microsoft 365 applications running inside your Vagon computer sign in through Microsoft's licensing and identity flows. Occasionally these flows can leave your account in a state where the Microsoft apps can no longer complete sign-in, even though the account still appears on your computer.

When this happens, opening a Microsoft app or trying to log in to your Microsoft 365 account can return a Device TPM problem error.

Depending on the flow, the same underlying issue may also be reported with one of the following messages:

• An unexpected error occurred.

• Keyset does not exist.

• The credential is invalid. Unexpected sub status (6008).

If you run into any of these, follow the steps below to re-register your account and restore access.

1. Close All Microsoft Applications

Before making any changes, close every open Microsoft application window (Outlook, Word, Excel, Teams, OneDrive, etc.). The account cannot be re-registered correctly while these apps are still running.

2. Open the Accounts Settings

Open the Settings app from the Start Menu, switch to the Accounts tab, and click Email & accounts to list the active accounts on the computer.

3. Re-Add Your Account via "Add a work or school account"

On the Email & accounts page, under Accounts used by other apps, click Add a work or school account and sign in to your Microsoft 365 account.

Do this even if your account is already listed on the page. Seeing your account under Accounts used by other apps does not mean it is registered correctly. You must re-add it through Add a work or school account to resolve the error.

Once you have signed in, you will be able to open your Microsoft 365 applications without any issues.

Common Mistakes

Two mistakes prevent this fix from working — avoid both:

• Clicking the wrong button. The blue Add account button at the top of the page is more prominent, so it is easy to click by mistake. It does not resolve this issue. You must use the Add a work or school account link under Accounts used by other apps.

• Leaving the page too early. If you see your account already listed and assume nothing needs to be done, the error will persist. Always re-add the account through Add a work or school account, even when it already appears in the list.