Wintrust Mortgage

RayKN

Trying to add Wintrust Mortgage to my register. Quicken's Suggested results include:
Elgin State Bank (now Wintrust Community Bank) and
Wintrust IBusiness Banking only. I tried to log on to each suggested name using my username and password but I was not recognized at either institution. When I asked the Wintrust Mortgauge represenetative about their banks possible other names I got the following:
Nation Star Mortgage LLC and
One Trust Mortgage Co. Here is their letterhead just in case it will help.
Wintrust Mortgage
PO Box 7729
Springfield, OH 45501
Insurance Service Center 833-702-2513
Customer Service Department 833-702-2515

UKR

Sounds to me like someone at the mortgage company's IT department should review and clean up this mess, working together with Intuit as their download service provider.

If I may, just my 2cents' worth …

I would not bother attempting to activate any loan or mortgage account for downloading. I would just simply set them up as "offline" (manual) loan accounts with a Scheduled Reminder to record the monthly payment from your checking account. 
(Not discussing LOC or HELOC accounts here. They should be set up like credit card accounts)

At least in Quicken for Windows, an online-connected loan or mortgage account does NOT have a transaction register. All data shown in the account come from whatever information the bank downloads to you ... if this process works at all.

As a result of being connected, the scheduled payment transaction reminder cannot transfer the amount of principal paid into the (non existent) account register and must use a category, usually something like Loan:Principal, instead. The category seems to vary with the Loan Type you selected when creating the loan account in Quicken.

Effective with Quicken Windows 2018+
you can deactivate an online-connected loan account and regain full control over your transaction register.  However, you should still review the Scheduled Reminder (or Memorized Payee List entry) associated with the monthly loan payments to ensure they now transfer Principal to the loan account register and not to a Category.

If you're a Q Mac user, you should be able to do something similar about setting up and maintaining an offline mortgage account together with a correctly calculated Scheduled Transaction Reminder for the monthly payments from your checking account.