Everyone playing a Forza title has a Gamertag, even on PC. To find your Gamertag, follow these steps:
Xbox App:
1. Open up the Xbox app on your PC
- To find this app, press the Windows Key on your keyboard and type "Xbox". Press Enter to open the app up.
2. On the left side on the app, you can find a small icon of your game profile picture. Click this to open up your profile, which should display your Gamertag and profile picture.
Xbox.com:
1. Navigate to Xbox.com
2. In the top left corner of the page, click "Sign In".
3. Log into your Microsoft Account
4. Your Gamertag should be displayed now where the "Sign In" button was before.