Bitcoin Forum

I recently trying to use my 32GB usb hadware using Tails with 2FA using Google Authenticator but keeps on failing when I entering the OTP. Any ideas?

Is your phone synced with the time servers? (settings>time corrections).

Have you kept your mnemonic? If you have you'll definitely be able to salvage the funds if necessary. Have you checked you're definitely using the right code too (you haven't made 2 wallets)?

What 2FA app are you using? As jackg suggests, check the time on both your computer and your phone are correct.

Did you back up the 2FA code you were shown when you first set up the wallet? If so, you can import it in to a different 2FA app to see if that works.

If none of the above works, then the likelihood is you have made a mistake during set up and are generating a 2FA code for a different wallet. Use your seed phrase to restore the wallet and choose the option to disable 2FA during the restore process.

This is my first time to create a wallet thru Tails,the last step says scan the QR Code and enter the OTP but failed. Admin is enabled and Wi-Fi is connected.
I believe I followed the steps but looks like something is not synching or maybe an update somewhere?

Ahh right, so you can't even create the wallet in the first place? In that case, it is almost certainly a problem with the times on your two devices being out of sync.

Again, what 2FA app are you trying to use? Google Authenticator? Try using a different one such as Aegis, andOTP, or Tofu. These are all better than Google anyway since they are open source and allow you to export and back up your database, which Google Authenticator does not support. Check the time and date on both your computer and your phone match (not just within a few minutes of each other, but as exactly as possible. New codes are generated every 30 seconds, so even a few seconds delay may render a code invalid).

If all that fails, then try using a different device for your 2FA authenticator app, or make a wallet without 2FA at all and save on the extra fees that 2FA charges.

You could always try 2fa'ing with electrum on your phone if you don't mind the app being visible in the home screen when using the phone normally - that way you'll again save fees and have similar security.

Generate seeds, copy across public keys somehow (qr code) and get a 2 of 2 multisig with the phone.

Then when you want to send a transaction you create it on the tails and sign it and then scan it with your phone (the camera icon on electrum).