We're experiencing the same issue. No option to review a guest who checked out several days ago. Even the next guest has come and gone with the option to do a review present. Any ideas why or suggestions?
Airbnb had a security issue and some hosts including myself have lost the ability to review and no longer receive a review notification.
Airbnb Support have said that this a global problem and they are trying to fix the glitch.
i have been without this functionality for 3 weeks which is a shocking timescale.