What is 2-Step Verification?
2-Step Verification is an added layer of security that means your account is still protected even if your password is compromised. It's a widely used and essential way to keep your account secure.
2-Step Verification requires users to verify their identity through something they know (such as a password) plus something they have (such as a code delivered to a device, an SMS text message for example.)
(Estimated time to complete 5-10 minutes)
Ingredients (You will need)
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Your work email account and password
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Your mobile phone
Method
1. On your computer. Open a private browsing window in Safari or Chrome and go to mail.yourcompanyname.com (i.e replace the red letters with your company name)
2. Sign-in with your work email address and password. You should be prompted with the follow notice. Click Enrol.
(if you're not prompted with this window to automatically enrol in 2-Step verification, continue to your account by visiting account.google.com and then click Security from the left hand menu, then scroll to 2-Step Verification setting, and continue the process from there. See below.
3. Confirm your password once again and click Next
4. Enter your mobile phone number which is to be used for 2-Step Verification, choose Text Message. Click Next
5. Your mobile phone will receive a Text message from Google, something like "G-123456 is your Google verification code". Enter the numbers only (eg. 123456). Click Next
6. Click Turn On!
7. The following page will confirm you have switched on 2-step verification. 
Lastly, you will need to reverify your email apps with this new 2nd step for them continue to send/receive mail.
On Mail app or Outlook on your computer, you should receive a pop-up prompt from Google asking you to reverify your identity. Follow the steps in the prompt to complete this verification.
On iPhone, please go to Settings > Passwords & Accounts > Tap your work email account listed > Tap Re-Enter Password and enter the SMS code when it arrives to your phone.