@user_x11bt5 Thanks for sharing. Let's try to figure this out together. Please visit this link https://www.xfinity.com/activate-peacock and log in with your primary Xfinity ID and password.

An Activate Now button at the top of your account if the Peacock Premium offer isn’t activated.

Follow the prompts you'll be redirected to the Peacock website to finish activation.

If you receive an invalid username or password message, go ahead and change the password for their Peacock account. Once complete, please revisit xfinity.com/activate-peacock and select the Activate Now button again to confirm your email address and password for Peacock.

You should receive a message saying the Peacock account is already active. If you do, please visit this link and log in https://www.peacocktv.com/. Please let me know if this works or not. 

As per your article, that is a different workflow. No wander it ends up in this:

We’re sorry, your account isn’t eligible for this Peacock offer

Thanks for trying, @user_x11bt5. I'd like to take a closer look at your account. Please send a direct message by clicking the chat icon in the upper right corner of the page, click on the pen and paper icon, then enter “Xfinity Support” in the “To” section.