As @spikysimon has pointed out: is your AK in overbridge mode? (GLOBAL/SYSTEM/USB CONFIG -> OVERBRIDGE)
And: are you using the latest beta version of Overbridge? Because only this one will work with the latest OS on the AK:
https://www.elektronauts.com/t/overbridge-2-0-24-public-beta/108025
My overbridge engine windows (accessible via the small Elektron logo in the status bar) looks completely different, even with the instrument disconnected.
And: this latest version is not (yet) compatible with MacOS Catalina…