How to enable 2FA for Slack
Install Authy
The best way to manage all your 2FA accounts is to use the Authy app. It enables you to have a single mobile app for all your 2FA accounts and you can sync them across multiple devices, even accessing them on the desktop. Install Authy on your device by searching for it in your device’s app store.
Important: If any sites prompt you to use Google Authenticator for two-factor authentication, note that you can always substitute the Authy 2FA app instead. Although they work in similar ways, Authy is more feature-rich and allows for multi-device syncing, cloud-backups, and easier account recovery should you change or lose your phone or device. Read more information on the features of Authy here.
Locate 2FA setting
Sign into the appropriate Slack team, and visit your Account page at my.slack.com/account/settings.
Then click “Account & Profile” in the navigation menu to the left.
Under “Settings,” find “Two-Factor Authentication” and click “expand”.
Read about Slack’s two-factor authentication offering, then click “Setup Two-factor Authentication”.
On the next screen, re-enter your password and then click the box that reads “Use an app. Retrieve authentication codes from the authentication app on your device.” This is the easier and more secure route over using SMS.
On the next screen, you’ll be asked to download the authenticator app of your choice – but you already did this in step 1. Then, it asks you to scan a QR Code with your Authy app. Keep this window open as you reach for your phone.
Capture QR Code
Take out your mobile device and open the Authy App. At the bottom of the screen, tap the plus sign to create a new account.
When you are ready click “Scan QR Code” and hold your device up to the computer screen.
The Authy App will automatically choose the Slack logo. Confirm it’s correct by clicking “Done”
Record the numerical token provided for Slack. Note that this token refreshes every 20 seconds.
Complete Enablement
Returning to the Slack website, enter the numerical token in the appropriate field. When done click “Activate.”
You will now be shown your Slack backup codes. These codes are one-time use each. Select to print them or copy them to keep them safe.
You will now notice that your Slack account has 2FA security enabled.
You’re all set! You’ve enabled 2FA for your Slack account.
To learn more, visit: https://get.slack.help/hc/en-us/articles/204509068-Set-up-two-factor-authentication