Welcome to the community.
There’s not an outage currently listed for Chase and the fact that part of your accounts link successfully seems odd so i would reach out to the Tiller support directly at https://sheets.tillerhq.com/auth/login they will be able to help you better for this specific issue.
I have my wife and my own chase accounts linked as well and havent noticed any issues with them lately but they also havent been used lately so there’s no activity to confirm that things are downloading.