I'm having the same problem. Am using Quickbooks Online.

My account quick updating on 3/25. The bank balance in the blue box reflects the balance on that day and has not changed in 6 days.

I click "update" and it says "updating" even past the site timing out to where I have to log in again.

When clicking the "Link account" button, it shows I am linked and today's correct balance is in grey. So the account is connected.