I aways get this same error [AAE error -200038]. At this time, Overbridge is not able to function as an AAX plug-in in Pro Tools. I am always able to see the Elektron devices selected in the Overbridge Engine, however they have never been able to function as an AAX plug-in, they work in standalone mode only. I have tried repeated re-boots and re-installs. I’ve waited years for updates with bug fixes so it would function within the DAW, however I have never once had Elektron either the AnalogFour or the RYTM function as a plug-in using Overbridge in Pro Tools. I believe Elektron still considers the software ‘beta’ and not successfully working yet, at least for those devices. Is anyone on this forum able to successfully get Overbridge to work as an AAX plug-in on either the AnalogFour or the RYTM?