IPhone 18 new phone will not allow Microsoft account access

While the Microsoft account remains accessible on the desktop, add a new verification method there first and then register Microsoft Authenticator on the new iPhone.

Register the new iPhone from the desktop

1. On the desktop, open the Microsoft account Security page:
   https://account.microsoft.com/security
2. Select Manage how I sign in.
3. Select Add a new way to sign in or verify.
4. Choose Microsoft Authenticator and leave the setup page open. Microsoft also permits alternatives such as a recovery email address or passkey; add one first if offered so Authenticator is not your only verification method.^1^
5. On the iPhone, install or open Microsoft Authenticator.
6. In Authenticator, select + Add account → Personal account → Sign in with Microsoft.
7. Enter the same Outlook.com, Hotmail, or Xbox account credentials and complete the additional verification requested. The documented personal-account setup process requires selecting a verification method and entering its code.[^2^](https://support.microsoft.com/authenticator/error-message-you-haven-t-finished-yet-with-passwordless-sign-in "Error message "You haven't finished yet" with passwordless sign-in")
8. Return to the desktop setup page and complete Next/Finish if prompted.
9. Test Authenticator by signing in through a private browser window before removing the previous phone or old verification method.

If the desktop Security page asks for approval from the unavailable Authenticator, select Other ways to sign in and use any recovery email, phone, passkey, or recovery code already registered.

If Authenticator was backed up on the previous iPhone

Use this branch only if Authenticator backup was enabled previously:

1. On the new iPhone, ensure it is signed in to the same iCloud account used on the previous iPhone.
2. Enable iCloud Drive, iCloud Keychain, and iCloud Backup.
3. Install and open Microsoft Authenticator. Backed-up eligible personal-account codes and account names should appear.
4. If the account says Sign in to restore your account, tap Sign in, enter the password, and verify using the requested email address or phone number.^3^

A personal account using a rotating one-time password can have that code restored. A passwordless credential is not backed up; only the account name is restored, so passwordless sign-in must be registered again.^3^

If iCloud itself cannot be accessed, contact Apple Support because Authenticator recovery on iOS depends on access to the relevant iCloud account.^3^

If no verification method is available

If the desktop session cannot add a method and every sign-in route requires the unavailable Authenticator:

• If two-step verification was not enabled, use Microsoft’s Sign-in Helper first and then the account recovery form if directed.
• If two-step verification was enabled and none of the registered alternative methods remains accessible, Microsoft states that support cannot bypass the verification or change the account details.^4^

Do not sign out of the working desktop session until the new iPhone has successfully completed a test sign-in.

References

1. Microsoft account security info & verification codes | Microsoft Support
2. Error message "You haven't finished yet" with passwordless sign-in | Microsoft Support
3. [iOS](https://support.microsoft.com/authenticator/restore-account-credentials-from-microsoft-authenticator#unable-to-restore-authenticator-account-credentials)
4. Help with the Microsoft account recovery form | Microsoft Support