I grabbed a key from a shared key button thingy in the VR thread
while on mobile, and I got a toast showing the key with the message saying it was copied to the clipboard and that it also was sent in an email.
The main thing is that it wasn't copied to the clipboard, so I don't have a way to use it now (nor can anyone else get it). I haven't received an email yet either (and it's not in my spam), but I'm fine with waiting on that if that functionality is working.
Pixel 2 XL