I received this error trying to update my NFCU accounts this morning. Went to the NFCU site to make sure it was up and I could log in. I tried resetting the accounts without success. I tried deactivating and reactivating without success. I just installed Quicken on a new computer but it tested out successfully last night.
Version 52.20
Build 27.1.52.20
Windows 11 Home
Version 22H2
Build 22621.2283
I was able to download and add the transactions manually from the NFCU site.