Hello @mesfeld​,
Welcome to the LastPass community!
I apologize for the inconvenience this is causing you. You can find the email mentioned under Account Settings > Show advanced Settings > Security > Security email. There you can delete it and leave it blank and hit update which by default will make your security email the eamil associated with the account or type the email associated with the account. You can find the process here: https://support.lastpass.com/s/document-item?language=en_US&bundleId=lastpass&topicId=LastPass/security-email-account.html&_LANG=enus
Kind Regards,
Alejandra
LastPass Support