Insure that the Cable connected to the appropriate analog output port is the Lynx CBL-AOUT85 or adheres to the Tascam DA-88 Analog I/O pin configuration.
Also make sure that the correct signal source is selected for TO ANALOG OUT from the Aurora front panel. For USB, Firewire, Thunderbolt, HD, Dante or MADI, the appropriate choice here should be "LSLOT IN", unless you have done customized routing with the Aurora Remote Control software. For use with the AES16e, or AES16 card the appropriate choice here would be "AES In".
Set the Aurora METER button to "ANALOG". If there is output meter activity, verify that your monitoring equipment is turned on and the levels are turned up to a safe listening level.