Newsletter and Notification Center, problem with activation link

Hi everybody,

I need to create Newsletter module, of course with Double opt-in, then my customer want notification for every new subscriber who are finished activation.
If I use standard Contao Newsletter module, everything is OK, but I need also notification for my customer. I tried with Notification Center, but not work.
I worked with Notification Center a few times, but for registration module, never for Newsletter.
I created new subscribe, unsubscribe and activation module, and also new notification messages, but the main problem is with activation link in user's e-mail. When user subscribe on Newsletter, automatically received activation e-mail with activation link. That link not work. In standard Contao module working normal, but with Notification Center not. When user click on link, nothings happening, and user can't finish subscribing.

Did anyone have same or similar problem? Maybe some suggestions.

Thank you very much