Enter the Steam login credentials for your Learning Lab and select the Remember me checkbox:

Once you have logged in, you will be required to enter the multi-factor authentication code sent to the email address that your Lab’s Steam account is registered with.

Sign in to https://mail.google.com/ with your account details.

You will have received an email from Steam Support <[email protected]> with the title Your Steam account: Access from new computer

(Check the updates tab or spam folder if you do not see the email.)

Enter the multifactor code into Steam Guard and you will then be able to access Steam.