Finally got around to updating to AME 2017.0.2 today from the 2015 version. Now when rendering GoPro media to XDCAM50i it doesn't render the audio... totally mute when it's finished.
The GoPro audio is AAC - 2015 release had no issues dealing with this.
I am sorry for the delayed response. Are you still experiencing the export with no audio issue.
Please post a screenshot of the export settings. FAQ: How do I capture and post a screen shot or video?