Oh no, I’m sorry to hear you lost your phone! What type of accounts are you using with Duo Mobile? For third-party accounts like Instagram or Facebook, you have to set a recovery password in Duo Mobile on your old device in order to be able to restore them from a backup.
We’ve answered this question before in the community. Please take a look at my response here for more help. We also have a help article that contains steps for troubleshooting this issue.
