This is quite easy to setup, but users have trouble with it.
Open your Twitch account from browser and confirm you channel name.
You may find these are already selected.
1. GENERATE TOKEN
Click Authorize if prompted
2. enable
chat:read,
chat:edit
3. Generate token
Scroll down page and click Generate Token Click Authorize, and put check in I am not a robot prompt
4. Open Racelab app Select Chat overlay and then click Appearence and then LINK page
5. Set access token here
6. In Racelabs be sure channel name is set and only lower-case letters are used.
7. Restarts Racelabs
8. Open OBS and add this url as browser Source http://localhost:8080/ui/#/overlays/chat
9. Scroll down until you see "refresh Browser Source" and add check mark
10. In Racelabs enable the chat overlay
11. When the overlay is on the screen you can test by going to twitch on your phone and click the Chat link.. Then enter text and click send
12. You should see the text sent from phone, in the overlay on the screen