Filling in forms in iPhone and accounts - personal and work

The message indicates that the form is restricted to work or school accounts and no longer accepts personal Microsoft accounts. This is controlled by the form owner, not by the device.

Key points from the behavior and documentation:

1. Microsoft services distinguish between:
   • Personal Microsoft accounts (Outlook.com, Hotmail, Live, Xbox, Skype, etc.).
   • Work or school accounts (Microsoft Entra ID / organizational accounts used with Microsoft 365 for business or education).
2. A Microsoft service only accepts the account type it is configured for:
   • “You can only sign in to the Microsoft service that your account is set up for.”
   • If a business/organization service is configured for work or school accounts, trying to use a personal account will fail.
3. What likely changed:
   • The form owner (organization) has switched the form or its underlying resource to require a work or school account only.
   • Previously, the form may have allowed personal accounts; now it is restricted.
4. Why the app sign-in still works:
   • Signing in to the Microsoft Forms app or portal with a personal account is still valid for personal Forms usage.
   • But when opening a specific form link that is configured for work/school accounts, the service will reject a personal account even if the app sign-in is successful.
5. What to do:
   • Use the work or school account requested by the form (if available).
   • If only a personal account is available, contact the form owner or the organization that sent the link and ask them either:
     • To allow personal accounts for that form, or
     • To provide access via a work or school account.

If there is both a personal and a work/school account on the same email address, the sign-in page may ask “Which account do you want to use?” In that case, choose the Work or school account option for this form, because the personal account will not be accepted.

References:

• What's the difference between a Microsoft account and a work or school account?
• Which account do you want to use?
• Services Hub sign in FAQs