HomeFixesHow to Fix Slack Two-Factor Authentication (2FA) Not Working

How to Fix Slack Two-Factor Authentication (2FA) Not Working



Slack is an essential tool when it comes to business and project management. As a workplace communication platform, the app is laden with features and rich with extras that make talking to coworkers efficient and effortless. But, because of how sensitive the information within the Slack app can be, using Two-Factor Authentication or 2FA is basically a necessity as opposed to a mere safety option.

It’s undeniable that 2FA or also called 2 Step Verification is much more safe and secure than most other forms of online account protection. But sometimes, it’s so secure that making a mistake like losing your phone number can lead to users not being able to access their accounts. Sometimes, even without making a mistake, you can still get locked out of your account. So, what can you do in these circumstances?

Photo credit: Scott Webb/Pexels

Well, worry not, we’re here to help. We’ve broken down the most prevalent and common reasons Two Factor Authentication doesn’t work, and given a simple troubleshooting solution guide for each one. Just follow the steps provided, and you fix the issue and should be back in your Slack account in no time!

Issue 1: Not Receiving Slack 2FA SMS Message on Your Phone

Solution: Check Your Country Code, Number and Service

  • First, make sure your country code is correct.
  • Make sure the phone number you’ve input is accurate.
  • Make sure you are in a location where you have mobile service.
  • Ensure that your phone is able to receive SMS text messages.

Issue 2: Phone for your Slack Two-Factor Authentication is Lost or Stolen / Phone Number Not Accessible

Solution: Contact Admin For Help

  • Contact your local admin.
  • Get your admin to reset your account.
  • Sign back in and set up a new 2FA lock with a new number.
  • In the case that your admin cannot help you, contact Slack at feedback@slack.com for further help.

Issue 3: Slack App 2FA or 2-Step Verification Does Not Work For No Discernible Reason

Solution: Contact Slack Directly For Help

  • In the case that nothing seems to work, your best bet regardless of the issue is to contact Slack.
  • Send Slack an email to feedback@slack.com detailing your issue.
  • Wait for further instructions for help.


2FA is a powerful tool in keeping your accounts and privacy safe, but it can also occasionally lead to headaches like this. On the bright side, at least all your information is secure! We hope this guide has helped you fix the problem and get back access to your Slack account, and stay tuned for more fixes and tips just like this!



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