Invalid License Error

[crankyashley]

Hello,

I'm attempting to re-set up Subsonic, as my server has kicked it.
When I go to Settings > Subsonic Premium and enter my email and license key, I get an invalid license error.
I had the key sent to my email again, just to be sure. Didn't change anything.
I went to an MD5 Hash generator, which also doesn't fix the issue.

Am I doing something wrong or is it actually an issue with my license key?

Thanks
C.A.