To create an account, you need to have configured Apple Keychain (iOS), Google Password Manager or Bitwarden (iOS or Android) as your primary password manager.
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There is a very good reason for this. At the moment of passkey generation, we check for backup eligibility, meaning that we will generate a passkey if your password manager can store a backup in the cloud. This way, we ensure you can recover your account if your device is stolen, broken, robbed, or if you decide to buy a new one. All you would need to do on your new device is initiate your Google or Apple account, and you will be good to go, recovering your Exa App account in just one movement.