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Hello Alba,
Thank you for reaching out to Microsoft Q&A Support forum.
I can understand you would like to get more information about transferring Authenticator app to another device. Not to worry, I will be providing you with the information you need.
When you try to move your authenticator app (like Microsoft Authenticator) to a new device, you might run into issues because the verification codes it generates are often tied to that specific phone.
If you're using Microsoft Authenticator and have cloud backup turned on for your old device, you can easily recover your accounts on your new phone by signing in with the same Microsoft account.
Important: You can only backup and restore on the same device type: accounts backed up using an iOS device cannot be restored on an Android device.
For further insights, please refer to the link below.
https://support.microsoft.com/account-billing/back-up-your-accounts-in-microsoft-authenticator-bb939936-7a8d-4e88-bc43-49bc1a700a40
Please do not hesitate to contact again if you need more help!
Thank you for your time.
Best Regards,
Obyziotta / Microsoft Q&A Support Moderator