Focus Mode: the person I spoke with is invisible

I recorded a coaching session in order to be able to use it as a demonstration. Because there where multiple viewers, I put on the focus mode and made my coach client a co-host. 
The plan was, that only me and my coach-client where visible but now I see that only I am visible. 
I recorded it on the cloud. Does anyone know if this can be fixed? I would like us both to be visible. 
Thanks for reading this and helping me out!