Could you please provide us more details about your accounts. To check your accounts please send us your email addresses that you have used to sign in into SQLBackupAndFTP.
We have resolved the issue - the license was registered under a different account. However there’s a more general question about “License in use”. This happens when a user tries to install a license on more computers that the license is purchased for (usually 1 computer). You can see the computers that are using the license on My Account page. If you want to remove the license click on the icon next to the computer: