SignIn using your existing login details on Magix Service Center or Create New Account on Magix Service Center. Here is the list of all links for Magix Service Center login.
https://www.magix.com/ap/mandants/servicecenter/index.php%3Fm%3Dsamplitude%26lang%3Dus
https://www.magix.com/int/support/technical-support/
https://www.magix.com/int/support/technical-support/pro-audio-support/
https://www.magix.com/ap/servicecenter/extcontent.php%3Flang%3DUS%26page%3Dprivacy
https://www.magix.com/
https://support2.magix.com/
https://www.magix-online.com/uk/login.1470.html
https://www.magix.info/us/forum/can-t-log-in-to-send-email--1198655/