I keep receiving this error when using YouTube API3

I keep receiving this error when using YouTube API3

I keep receiving this error when using YouTube API3

I keep receiving this error when using YouTube API3

I keep receiving this error when using YouTube API3

I have thousands of new-video notifications on YouTube. I’m a crazy power user, and I want to (at least) look at all of them, preferably save them for later in a big list (like exporting bookmarks).

Please assist this situation.

I created an app for the members of my youtube channel, and my goal is that only the members can access it, so I’m trying to use the Youtube data API, to retrieve my members:list. So that u can have an automatic whitelist with my members. My problem is that i get a 403 error code and it says that i need permission to do this, even though i make the request by using the token i get when i connect the youtube channel account to the app using OAuth2.0.
It looks like i’ve done everything i could and that now i just need a permission from Google or Youtube, my question is where do i get that permission?
Because i haven’t found anything in the documentation, so please i really need help.

We are part of the Google Startups Program and are Building AI Tools and Agents.

I was invited to a YouTube channel. To accept the invitation, I had to create a channel. Now, I have two channels.