When Twitch has the error of “redirect URI mismatch” I redirects to the first oAuth URL in the list. So that might be what you are currently seeing.
I’ve never used a URL with # as a URL redirect as that normally means “go to this anchor on a page”. So I wonder if you have stumbled on a unexpected outcome from using this.
Generally a URI will end with a /
So as far as I know the correct URL should be
https://www.follow4follow.tv/#/dashboard/
Having checked your dashboard it is declaring
https://id.twitch.tv/oauth2/authorize?response_type=token&client_id=kz6qzdszljw10pr9xynwv1acoo7dsy&redirect_uri=https://www.follow4follow.tv/
So it’s either not encoding the URL correct and it’s ignoring everything after the #
Since it should be
https://id.twitch.tv/oauth2/authorize?response_type=token&client_id=kz6qzdszljw10pr9xynwv1acoo7dsy&redirect_uri=https%3A%2F%2Fwww.follow4follow.tv%2F%23%2Fdashboard%2F
Which is also doing the complaining about the redirect URI
But I cannot see what your tool is actually generating, only the end result after the redirects round the houses
Can you post a screenshot of what you currently have your dashboard set to?
And make your tool spit out a link to click rather than redirecting?