To add a passkey, please follow these steps:
Go to Profile > Settings > Security Settings > Passkey and tap Add passkey.
Complete identity verification.
Your device will show a system dialog. Some devices first ask where to save the passkey (e.g., "iCloud Keychain" on Apple devices or "Google Password Manager" on Android devices); keep the default option and click Continue.
Confirm with Face ID, your fingerprint, or your device passcode, then give the passkey a name you will recognize (e.g., "My iPhone").
Please note that the TradeUP app must be updated to version 9.6.2.0 (or later) to utilize this feature.
Still got questions? Contact TradeUP Customer Support by email at support@tradeup.com or reach out to us on Live Chat!