Discover Card would not update today. I tried to reset my account, but it failed and also deleted the online setup. The Discover App displays a message that some features are not available through the weekend as they get ready for the transition to Capital One.
I'd recommend that others just leave it alone for the weekend so as not to cause other issues when Capital One goes online.
Quicken should provide some guidance or at least an announcement regarding how users should manage the transition to Capital One in Quicken.