Hello! @a3lexz
Welcome to the LastPass Community.
Regarding your request, you have multiple option to move the authenticator from one phone to another:
Use the export accounts to QR code:
Using your LastPass authenticator, please go to settings, transfer accounts, and transfer accounts to QR code. Once you get the QR code using your new phone, open the LastPass authenticator app and scan the QR code using the new phone.
Reset the LastPass MFA from your account settings:
Access your account using a computer, go to your vault, go to account settings, multifactor option, find your MFA enable, click on the pencil, and then go to reset, follow the process, and then you will be able to scan a new QR code with your new phone.
Please let me know if you need additional help.
Greetings!
Verlaine | Customer Care