Save game support, how do I load audio in a sertain time frame?

I am working on a save game for my game. I want to load a sound at the position where it was in its track when saved. Trying an approach simular to how I save my animation state I came up with this:

 // save function is saving audio.time

 // load function    
     var soundState =  ES2.Load.<float> ( cSaveManager.savePath + "?tag=soundState" + uniqueSaveID );
     Debug.Log(soundState);
     
     audio.Play();
     audio.time = soundState;

The debug log shows the time that was saved. So it looks like I can't set a audo too its time using audio.time. How can I set the auto to the desired position in the track?