Embedding channel doesnt work

Hi – great plug in – but I’m having a total fail on embedding my channel. Works fine for single videos. Hoping you can point out where I’m going wrong! Thanks in advance.

Details
Using Cloudflare (tried with dev mode on also)
WP Rocket
https://wbsociety.com
YouTube API set to URL referral, have set *.wbsociety.com/* and https://wbsociety.com* as auth URL
Example video attempt: https://www.youtube.com/watch?v=3Ng7UK1T8fE

As mentioned above, it works fine for that single video. I’ve searched the forums and have seen the question posed before but no resolutions. Before I’d consider paying for the pro version, I really want to ensure that it does what I need it to do. Really appreciate your help 🙂

Error

Sorry, that does not seem to be a link to an existing video. Please confirm that the link works in your browser, and then copy that full link in your address bar to paste here. If you are sure your link is correct, then your API key may be too restrictive (https://console.developers.google.com/apis/credentials).