Using AXR4 with another AD/DA, such as, Lynx Aurora n

Hey all, trying to revive this thread as I am currently trying to hook up an Aurora 8 to my AXR4 via AES.

Neither box is seeing AES lock from the other.

Using a straight DB25-DB25 verified pinouts as 1 to 1 with a meter.

Any help would be appreciated.

/r.