My Mac Cannot Sync Contacts After Opting in to Two-Step Login for Office 365

This article applies to: Two-Step Login

User Experience

If you use the macOS Contacts app, you may not be able to sync your contacts after opting in to Two-Step Login for Office 365.

What to Do

Select System Preferences.
Select iCloud.
Deselect (uncheck) iCloud Keychain.
Select OK.

Two-Step Login Articles

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Office 365

Before You Start Using Two-Step Login with Office 365

How It Works Whether Two-Step Login has been mandated for your Office 365 account or you are choosing to opt in, it protects access to your email, calendar, and all other Office 365 services...

Configure the Apple iOS Mail and Calendar App for Use with Two-Step Login

How to update your cornell.edu account profile so you can use Two-Step Login for Office 365 with Apple's iOS Mail and Calendar apps on your phone or tablet.

How Often Will I Be Prompted to Login to Office 365

How often Office 365 will prompt you to authenticate on Office 365 applications or Outlook on the Web.

My Mac Cannot Sync Contacts After Opting in to Two-Step Login for Office 365

User Experience If you use the macOS Contacts app, you may not be able to sync your contacts after opting in to Two-Step Login for Office 365. What to Do Select System...

Office 365 and Two-Step Login

Frequently Asked Questions (FAQ) about Two-Step Login for Office 365

Office 365 Is Not Prompting Me for Two-Step Login

User Experience Office 365 is not prompting me for Two-Step Login, even though I opted in. Explanation Except when you are using Outlook on the Web (outlook.cornell.edu),...

Test Two-Step Login for Office 365

How can I tell whether opting in to Two-Step Login for Office 365 worked?

Two-Step Login Authentication Prompt for Office 365

Why is the prompt for the second step of logging in to Office 365 different from what I usually see? When there is not enough room on the page to display the regular prompt, Two-Step Login...

Troubleshooting

I Can't Log In Using Two-Step Login

Common troubleshooting tips for Two-Step Login problems, including a disabled account, time away from the university, blocked connections to Duo Security, and conflicts with Dragon NaturallySpeaking.

What should I do if my Two-Step Login device is lost or stolen?

What to do if your device is lost or stolen

Can I use Trust Browser in Two-Step Login if third-party cookies are blocked?

Yes. Trust browser uses "first-party" browser cookies, which are not typically blocked. Details about the Duo prompt and cookies can be found at Can Duo's Remembered Devices...

Configure the Apple iOS Mail and Calendar App for Use with Two-Step Login

How to update your cornell.edu account profile so you can use Two-Step Login for Office 365 with Apple's iOS Mail and Calendar apps on your phone or tablet.

Exchange Account Warning for iOS

What to do if you see the following warning, "Adding an Exchange account will allow the Exchange administrator to remotely manage your device. The administrator may collect personal data, add/remove accounts and restrictions, list, install, and manage apps, and remotely erase data on your device."

How do I unlock my account in Two-Step Login?

What to do if your Two-Step Login account is locked

I Forgot My Device or Passcode for Two-Step Login

How to use Two-Step Login if you don't have access to any of your enrolled devices or passcodes

I'm Having Problems with My Hardware Token for Two-Step Login

Troubleshooting common problems with a Two-Step Login hardware token

My Account is Disabled

Instructions to access your account if it was disabled.

My Mac Cannot Sync Contacts After Opting in to Two-Step Login for Office 365

User Experience If you use the macOS Contacts app, you may not be able to sync your contacts after opting in to Two-Step Login for Office 365. What to Do Select System...

My Security Key Does Not Work with Firefox for Two-Step Login

What to do if your Two-Step Login USB security key does not work in the Firefox browser.

My U2F Security Key Prompts Me to Update

Why is my U2F (USB) Security Key prompting me to update? What to do if that happens.

Office 365 Is Not Prompting Me for Two-Step Login

User Experience Office 365 is not prompting me for Two-Step Login, even though I opted in. Explanation Except when you are using Outlook on the Web (outlook.cornell.edu),...

Remember Me for 24 Hours Does Not Work in Safari

User Experience The Remember me for 24 Hours checkbox does not work with Safari 13.0.4 and up on devices running macOS Mojave 10.14. Solution There are two options...

Replace Your Smartphone Listed in Two-Step Login

How to replace the smartphone you have listed in Two-Step Login using a new phone with the same phone number or a different phone number.

Troubleshooting: Duo Updates to USB Security Key Method

Beginning in mid-January 2022, Two-Step Login users who authenticate using a USB security key (hardware token) will need to update their key and should expect an extra step in their login process.

Two-Step Login Authentication Prompt for Office 365

Why is the prompt for the second step of logging in to Office 365 different from what I usually see? When there is not enough room on the page to display the regular prompt, Two-Step Login...

Why Can't I Opt Out of Two-Step Login?

The Expand Where You Use Two-Step Login tab does not show and the Opt Out button is not available.

Why Can't I Use KProxy with Two-Step Login?

Two-Step Login is not compatible with KProxy. Instructions to use WebDAV instead.

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My Mac Cannot Sync Contacts After Opting in to Two-Step Login for Office 365

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