If you’ve created a YouTube tab and are having issues displaying your channel, try these troubleshooting methods.
Did you follow this tutorial and it didn’t work? It may be because your YouTube channel URL is not actually your username in YouTube’s API.
To troubleshoot, click on one of your YouTube Videos. While on your YouTube Video, click your username and it’ll bring you back to your homepage.
You’ll notice that your URL is different now, this is actually the URL that YouTube has for your page in their API.
Copy and paste, like the example below:
Still not working or updating? Facebook probably has your tab cached. Go to your tab on Facebook and click “Refresh Cache” at the bottom of your tab.