@Relayer74 I assume you used a different e-mail address in the past? The license might be bound to your old Sony customer account e-mail address. All customer accounts where transferred from Sony to Magix. So you need to login with your old e-mail and password.
@Relayer74 I suggest you contact customer support at infoservice@magix.net
You'll first get a response from the AI customer support bot. Make sure you respond to it or select that it answer didn't help. It needs to know that you want help from a human support staff member. After that the bot should forward you to a staff member. But it can take some days until you'll get s response. Maybe Monday or Tuesday.
I'm pretty sure I have used the same email since the beginning
The email address you use to login to the Magix forums and the address you used when your SF-11 was initially registered (with Sony) may be different, so double-check. If all else fails, contact Magix support as was stated and may take a while. As I understand, support for SF is being transitioned over to the Vegas camp.
btw, welcome to the Magix Sound Forge users community @Relayer74.
With apologies, but I have removed the image you posted earlier since it includes your personal and confidential serial key which should never be posted to a public forum like this one. By showing it here you make it possible for "hackers" to use it and so make your problem even greater.
Please do not post any confidential information in the forum, I have hidden your comment.
in addition to @emmrecs comment, confidential information includes support ticket numbers, email address or any other contact details.
From the Magix response it looks like you are having issues with a Vegas product, in which case this is the wrong forum.
Vegas products, with the exception of Magix Movie Studio 18 to 2025 inclusive, have their own forum, link is at the bottom of this page, I would suggest you post your question there