How to fix "The credential is invalid"?

Hi @Glinfung Dusita (PS/QMC21-JP)

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As my research, the response message "The credential is invalid", along with the provided Correlation ID, Timestamp, DPIT, Tag, and Code (-1664158832), might relate to authentication issue from Microsoft services. It typically appears when signing into Microsoft 365 apps, especially with a work or school account (managed via Microsoft Entra ID, formerly Azure AD). 

You could try to follow these steps to troubleshoot it:
Remove and re-add your account in Android settings

Go to Android Settings > Accounts  

Look for Work or school account or any Microsoft / Entra / Office 365 / company‑linked account. 

Select it > Remove account. 

Also check under Settings > Apps > Outlook > Set as default (or similar), and clear any defaults if prompted. 

Restart your phone. 

Open Outlook, add the account again, and sign in (it should prompt for a full login and MFA if required). 

Access through OWA: 

Test logging into your email via a Outlook Web App on the same phone, if that works but the app doesn't, it's likely an app/device token issue. 

Additionally, if none of these approaches work (especially since the account is flagged as a work/school account), you may consider reaching out to your organization’s IT admin for deeper investigation. Provide them with the exact details you shared: The Correlation ID, Timestamp, DPIT, Tag, and Code. With this information, your IT admin can trace the exact failure in the authentication system (often related to token validation, MFA issues, or cached credential conflicts). They may also assist you with: Resetting your password, re‑enabling your account if it has been disabled, requiring you to sign in again with updated security information 

To help us better address your issue, could you please provide additional information for the following questions: 

Any recent changes to your account? 

Have you tried to connect with another device, and does the same behavior persist? 

Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution. 

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