First of all, thank you for your answer. But unfortunately it did not solve the problem.
The key is indeed a uniquely generated key.
But what’s the problem:
1. I am posting VIDEO A successfully. The unique YOUTUBE code is accepted.
2. I delete VIDEO A because I wanted to post other videos first
3. After placing for example VIDEO B to F, I placed VIDEO 1 again.
4. If I then re-enter the unique YOUTUBE code of VIDEO A (the same as in point 1) it will no longer be accepted by the plugin. I get the message: “the unique video key was not accepted”.
The problem is, it seems to me, not with Youtube … but more with the plugin. It apparently stores the unique code that was once entered, even if the video in question has been removed from the plugin.
The question then is: how can I remove that unique code from the plugin?!?
I am curious about the answer.
