Make sure that your channel is enabled for live streaming: 

If your channel isn't yet enabled for live streaming, trying going live via the new YouTube Live Studio:
https://studio.youtube.com/channel//livestreaming/webcam

Re-configure your YouTube channel in Loola:

After you manage to successfully stream live on your channel, open the Loola Settings page at: https://app.loola.tv/configure-platforms

Click the YouTube icon, and then click "disconnect":

Next, click the YouTube icon again and select "Connect YouTube":

Select your Google account and then the YouTube channel. Next click "Allow" in the following page:

If you see a green check-mark, then it means you successfully connected your YouTube channel:

Lastly, go back to the main Loola studio page:

Make sure the YouTube icon appears in color (if not - click it):

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