I'm having the same issues with QB and 2 factor authentication.  I'm the owner and my bookkeeper keeps asking me "over and over" to reconnect the accounts.  Now that is not even working.  I've had to BNS software from my phone already and put it back. A nightmare in itself.  Still not working.  I'm seriously considering dropping both BNS and QB if I can find a better solution. This thread about the issue has not been resolved. Its a software issue. Should be solvable.  I blame both QB and BNS.