@John-and-Terese0 It would be better if you went to the website, and clicked on the email alias link there. That should open your email, and then you can conduct the conversation with the guest.
I have found that the address that appears on my phone mail or my regular inbox is further disguised and does not, in my experience, result in my response being sent to the prospective guest.
I have also found that if I try to reply to a text message on my phone without clicking on the reply link in the message that takes me to the app, that my text message goes to cyberspace and is not seen by the guest.
All in the name of "protecting" AirBnB's interest in keeping the guest and host on a money making platform.