Lets start over in that case.
Your topic says “subscriber notifications”
Your last post talks about “logging in”
And now you are after follower notifications.
That’s three different things.
The last is public data and works with any kind token
Logging in, assuming you mean chat will require a user token
And the first is subscription data, which requires a user token from the broadcaster.
That’s 2 different token types across three differrent “user types” (where one user is not a user but a server)
I don’t know what you are actually trying to do.
This error states you have not included an oAuth token.
I’m gonna guess you are using the followers webhook?
In that case you probably need an App Access Token.
But can you confirm what you are actually trying to do. What ends points you are calling or intending to call.