IMPORTANT:A lot of the bigger investors (and some of the smaller ones) have enabled 2FA to protect their accounts. This is a great idea, and it helps a lot in the event that your computer is compromised.
However. I often get emails from people who have lost their phones, or had them crash, or reset them, or upgraded, etc. and who therefore can no longer generate valid 6 digit 2FA codes. They usually expect me to just turn 2FA off on their account.
This kind of misses the point. If I were to just turn off 2FA whenever I was asked, what's the point of having it?
So please,
if you have 2FA enabled, make sure you have a backup copy somewhere offline (on paper in a safe, for example) of either
1) the QR code you used to set it up
or
2) the 16 character string in bold under the QR code
The screen you see that sets it up says in bold letters at the bottom to make a backup of the code, but it seems people often fail to do so (the image is just a sample - this isn't YOUR 2FA secret):
If you already have 2FA enabled, but DON'T have a backup of the secret, you can edit your 2FA settings, disable 2FA, then re-enable it to see the QR code and 16 character secret again.
Please make sure you have a backup!
.
I would love to invest there 
