Did you try deleting and re-creating the account with the new settings? You can try it with 102 but then remove the ClientID. 102 does not require it and 103 does. However, with AppVersion 2600 (Quicken 2017) I think it now requires a ClientID to work. Did you also try older versions of Quicken? Maybe try APPVER:2400 (Quicken 2015) or APPVER:2500 (Quicken 2016) and APPVER:102
I too am having problem using OFX and WF since mid-June, I tried changing APPVER:2600 and VERSION:103, didn't help, I then added OFXVER:103, did not work either, I then got a Client UID and added CLIENTUID:..., didn't work either.
When I make the call to https://ofxdc.wellsfargo.com/ofx/process.ofx, I get nothing back!
I also downloaded transactions from WF online website in quicken format and when I look at the qfx file, it still has Version: 102