Within Teamwork, you can use OneLogin to access your site.
Note: Teamwork’s SSO offering is part of the paid Advanced Security add-on which you can purchase in addition to your Teamwork subscription.
In order to use OneLogin, you will first have to configure your SAML (Security Assertion Markup Language) for Teamwork on your OneLogin account.
You can find steps to set this up on the OneLogin help center.
For more information, see: Single Sign-on (SSO)