Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I was taking a look and Audi Financial services and unfortunately is it not able to be connected currently through quicken. In this case what I would recommend is to make a manual loan account. One of the biggest benefits of this vs a downloaded account though is you're able to adjust the payments in a manual register. One of the things I would recommend is that from your checking account you'll have your payment amount likely going to a car loan category. Instead of the car loan category you'll want to create a split where part of it is going towards the loan account (This is principal) and the other to interest. I'll link a photo down below to explain it a bit better as well.
Hopefully I did explain this well enough to help you out. If not let me know and I'll try making a more detailed explanation.