Originally Posted by
DYKWIA
Eh?? Being "overseas" has no impact on how the authentication works. As mentioned upthread, you can print off 10 single use authentication codes that you can use if you don't have your authentication device with you. Keep those in your wallet.
Frankly, I've been using this type of 2FA for 25 years now and its works very well for travel and when one is going to be in either remote locations (maybe without cellular) or if one has to authenticate without a current 2FAD. I print 10-20 codes and put them in a small sheet in my wallet, and put the codes in a spreadsheet in my laptop in a spreadsheet with a password file. Make sure to cross them off after use.