Chrome 63.0.3212.0 (Official Build) canary (64-bit) (cohort: 64-Bit)
Windows 10 Enterprise Version 10.0.14393 Build 14393.1593
NVDA 2017.3

# Prepare a Google account that uses two factor authentication 
# Get browser into a signed out state, either install Chrome for the first time or sign out of existing install
# Navigate to three dot menu > Settings > Sign into Chrome, enter username and password to get to two factor authentication screen. 

If your TFA is set to use a security key: 
# Upon screen asking for security key, tab through page. Focus shifts from Back button to "Problems with your Security Key?" and does not read the text in the middle, which is "Insert your security key. If your security key has a button, tap it. If it doesn't remove and re-insert it." 

If your TFA is set to use a code sent via text message:
# Upon screen asking for 2-step Verification, tab through page. Focus shifts from Back button to the field to enter the code and does not read the text in the middle, which is "2-step Verification, A text message with a 6-digit verification code was just sent to" and the phone number. 
After some time, if a code is not entered, a button and message appear. The message text is skipped, it says "Haven't received the code yet?". The button RESEND CODE is focus-able via tab.  

If your TFA is set to use a backup code: 
# Upon screen asking for 2-step Verification, tab through page. Focus shifts from Back button to the field to enter the code and does not read the text in the middle, which is "2-step Verification, Enter one of your backup codes."