When a passkey stops working after you switch phones, it's usually not Binance's fault. It's because of how passkeys are designed: the new phone doesn't have the matching passkey. Passkeys from your old phone do not automatically sync to the new phone—unless you're using the same cloud service.
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Passkeys are based on the FIDO standard. They work with a public‑private key pair, and the private key stays on your device, not on Binance's servers. When you switch phones, if that private key doesn't come along, Binance will receive no matching signature, and the passkey will fail.
Step 1: Find out how your old passkey was stored
Think back or check your old phone. Open the Binance app, go to Account Center → Security → Passkeys, and see what storage option you used when you created the passkey. The goal is to confirm whether it was iCloud Keychain, Google Password Manager, or local device storage only.
Case A: iCloud Keychain (iOS devices)
If you created the passkey on an iOS device using iCloud Keychain, it syncs to all your Apple devices signed in with the same Apple ID. When you set up a new iPhone with the same Apple ID and iCloud Keychain turned on, the passkey should come over automatically.
Case B: Google Password Manager (Android devices)
Similarly, a passkey created with Google Password Manager syncs to your Google account. On a new Android phone signed in with the same Google account, the passkey should work right away.
Case C: USB/NFC security key or "Saved only on this device"
If you used a USB/NFC security key or chose the "save only on this device" option, the passkey does not sync anywhere. It lives only in the old phone's hardware. In this case, after switching phones, the passkey will indeed stop working because it was never backed up to the cloud.
Step 2: Make sure the new phone uses the same cloud account
Check that the Apple ID or Google account on the new phone is the same as on the old phone. Open the new phone's system settings and look at the iCloud or Google account details. The goal is to confirm that the cloud account matches and that passkey syncing is turned on.
If the account matches but the passkey still doesn't show up, it could be a sync delay or a permissions issue. Binance's official advice: if you plan to switch devices, sign in to a different iCloud account, change system passkey settings, or reinstall the Binance app, first disable the Binance passkey verification feature. Otherwise you might get locked out.
Step 3: Turn off "Must use passkey verification" before switching phones
If you have enabled "Must use passkey for important actions," turn it off before switching phones. On the old phone, open the Binance app → Security → Passkeys → turn off the "Must use passkey verification" switch, and confirm with your old passkey. Once this is off, even if the new phone temporarily has no passkey, you can still log in and withdraw.
Risk reminder: Binance clearly warns that once "Must use passkey verification" is turned on, if you can't use passkey authentication, you will not be able to log in to your Binance account. If you didn't turn this off before switching, and the old phone has already been wiped or sold, you'll have to go through the 2FA reset process to regain account access.
Common reasons for failure
Many people think a passkey works like a regular password—just remember the account and you're in. But a passkey is tied to a specific device or cloud account. If you switch phones and use a different Apple ID or Google account, you might still log in to Binance but the passkey prompt won't pop up. Another easy miss: Binance Web3 Wallet and Binance account passkeys are separate. Restoring a Web3 wallet on multiple devices requires the same type of device, and the two cannot be mixed.
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Next steps
If you've already switched phones and the passkey doesn't work, the safest option is to go through the 2FA reset process first, then create a new passkey on the new phone. When creating it, choose iCloud Keychain or Google Password Manager so it can sync across devices. If you still have the old phone but syncing isn't working, you can use the old phone to scan a QR code from the new phone for cross‑device verification. After the new passkey is set up, go back to security settings and turn "Must use passkey verification" on again.
