Preparing your authenticator appears while the setup details are being created. Wait for either the QR code or an error message before scanning an older image from another attempt.
If an error appears, read it and check the network connection. Close the dialog when it is no longer processing, then start Set up authenticator app again from Security. Use the QR code or setup key from that fresh attempt.
Institution attempts to clean up unverified setups when a dialog is abandoned. An entry created in your phone during an incomplete attempt may therefore be unsuitable for a later setup. Keep track of which attempt produced the entry you are verifying.
After a successful setup, look for Two-factor authentication enabled and the Enabled badge. If the dialog repeatedly stays in preparation or returns the same error, contact support with your browser, device, and error text. Avoid capturing the setup key or QR code in a screenshot. Do not rely on an unfinished enrollment as protection for the account.
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