I'm sure it's user error, but ...

I had a manager connect me with ManyChat a few years ago, but I haven't used it for a while. Trying to create a new connection with it so I can do some automated responses. But as I go up to verify, it tells me that I already am connected. and I need to switch accounts. But every time I switch an account or click the button to switch an account, it just has me doing the same thing over and over again. I feel like I'm in a loop. When I click on the “request” email, it literally sends me back to this same thing. Any help would be great.