Your MAGIX login data is not valid for the activation of the plug-in.
For this purpose, a separate registration with the respective manufacturer is required.
Normally, you can do this directly during or after the installation of the plugin.
For any requests concerning Plugin registration, please refer to the respective Plugin Producer.

FXHome (HitFilm, Ignite)

Plug in Registration can also be performed directly via https://fxhome.com/register
Support: https://fxhome.com/contact 

NewBlueFX

Plug in Registration can also be performed directly via 
https://www.newbluefx.com/login/
Support: https://www.newbluefx.com/about/contact/ 

proDAD

Plug in Registration can also be performed directly via
https://www.prodad.com/Login/Registrieren-29759,l-de.html 
Support: https://www.prodad.com/Kontakt-zu-proDAD-29758,l-de.html 

MotionStudios

Plug in Registration can also be performed directly via
https://motionstudios.de/registrieren.php
Support: https://motionstudios.de/Kontakt