After 2 months of having to manually download Wells Fargo credit card transactions via direct connect and trying multiple fixes to get express connect to work (see prior discussions), I got it fixed today.
First, I deactivated downloads for my Wells Fargo account in quicken. Then I went to Wells Fargo and searched 'manage connected apps'. I saw quicken as authorized. I deauthorized it. I went back to quicken, went to wells account, edit account details, on line services and set up downloads. It took me through the Wells Fargo site, I had to sign in and it sent me a text for 2 factor authorization. Quicken then was able to reestablish express connect and voila!, IT IS NOW WORKING!