Occurring on Quicken Classic for Mac Version 7.9.1 (Build 709.54540.100) on macOS 14.6.1 (all up to date).
Interactive Brokers (IBKR) fails to update with Quicken using Direct Connect. Fails with OFX Error: 16503. I am using a correct/active Query ID and Token from Interactive Brokers. Failures started yesterday (9/9/24).