Your API key may be too restrictive. If you embed this gallery (from TED Talks) on a test page, what do you see? The gallery, or an error?
[embedyt] https://www.youtube.com/embed?listType=playlist&list=PLOGi5-fAu8bEFGhGHSHwxXZJia0mfNs5d&layout=gallery%5B/embedyt%5D
Note for out how-to video for creating API keys, while it may be slightly outdated, you’ll see that no restrictions were checked in the process of generating the API key.
-EmbedPlus Team
Can we assume this is resolved?
Hello, I have the same issue. I created an API key, it’s unrestricted, and it keeps erring out that it’s not a valid youtube video. Even tried your TED video link and a single TED link got the same thing. I can embed a single video but want to add the channel. I even added the domain verification just in case.
“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).”