This integration works for U2F supported browsers (Chrome and Opera). Verify that your Ledger Nano S and its Bitcoin application run the last update.
To update the Ledger Nano S refer to our step by step tutorial. To update the Bitcoin application, open the Ledger Manager, uninstall the Bitcoin application (by clicking on the trash icon), and install it again.
First, you need to enable browser support for the Bitcoin application.
To do so power your Ledger Nano S, enter your PIN and go to the Bitcoin App. Then select settings, Browser support and press the right button to enable the feature.
Once you set up the browser support you can Login on BitGo and follow their step by step tutorial.