Activation manager "cant change my username" no licence found HELP¡¡

Yesterday I opened Cubase 12 and the message “no license found” appeared, so I opened the activation manager, it opened but with an old email (as user) and it won’t let me change it so it doesn’t recognize my license.
please help

Please click the icon to the top right of the Steinberg Activation Manager to sign-out from your old account.