It has been months and AirBnB in unable to fix this problem. The key icon from the inbox is gone. There is no way that I can send the instructions link to the guest anymore.
I have the same problem. My messages have also frozen and so instead of saying sent the message is sitting in green saying sending. I have updated the App. Turned my phone off and on and still no fix. Can anyone help ??
It seems the latest update removed that option, and we need it back! It's very difficult to send instructions now to people that don't read the instructions (quite a few guests, unfortunately!). Please bring this back to the app!