2

Go to Account Settings, Security. The default is to ask for 2FA only over $100/day. Change it to ask every time.


2

Disclaimer: I work for 2FA company CryptoPhoto Google Authenticator does not save you from phishing or MitM/MitB or malware like NeverQuest, Hesperbot, Zeus, Ice IX, Bugat V2, Carberp, Citadel, Syscron, SpyEye, etc - or any APTs at all. In addition: Google Authenticator (GA) is not open source (only same antique version no longer in use ever got ...


2

The only reason I can think of that would result in the above with a valid OTP seed is invalid OTP settings (but default should work for Google Auth) OR incorrect time on the device OR invalid time (drifted) on the GreenAddress service clock. I checked for the last one personally and the services clock is fine: in my experience most of the time is time/...


1

As you have correctly noticed none of the Bitcoin exchanges have implemented the FIDO standards there is not a large demand for this feature from what I gather. If the standard were to gain mass adoption and many users began requesting it I'm sure it would become a greater priority for exchanges to implement. As a side note the Ledger hardware wallet ...


1

You should have the option to remove / change the 2-factor Authentication under Settings >> Personal Details, though this may have changed. My guess is you'll probably need to contact Coinbase support if nothing else has worked so far: http://support.coinbase.com/customer/portal/emails/new


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