Do a google search for "Wells Fargo FMS Setup". The first search result should be the following:
Once you click the link, you will need to enter your user name as password and then hit "Sign On". It will then ask to send a 6 digit code to your mobile (or other) device which you will need to enter in the box provided.
Once you do this, it will show a message that you have 10 minutes to complete the bank feeds setup within the Quickbooks program. You must immediately go into your Quickbooks program and complete the "Bank Feeds" setup, by clicking Banking > Bank Feeds > SetUp Bank Feed for an Account. Search for your bank, select it, then enter your user name and password. Once you are logged in, select each account shown and map it to the appropriate bank account in your chart of accounts.
I am using Quickbooks Premier for Accountants 2016, and I just successfully completed this process for one of my clients. They had recently changed their Wells Fargo login password and that is what triggered the problem.
Hope this helps!
Mike Garcia, CPA