You can enable or disable the chat comments in YouTube:
Open the YouTube Studio Live settings:
https://www.youtube.com/live_dashboard
Click the Edit button:

Make sure that chat is enabled:

Click Save.

You can enable or disable the chat comments in YouTube:
Open the YouTube Studio Live settings:
https://www.youtube.com/live_dashboard
Click the Edit button:
Make sure that chat is enabled:
Click Save.