Incase you can still use Google Authenticator on your old device.
1. Sign in
2. Go to Security >> 2Factor Authentication
3. Turn Off “Enable Two Factor”, enter 2FA code and click “Submit”
4. A QR code will appear on the screen, you can use a new device to scan. (https://support.bitcoin.co.th/knowledgebase.php?article=41)
5. Delete Google Authenticator App from your old device.