I'm not able to leave a reviwe to a guest either... I just wrote this 30 minutes after you as I was looking for some help on this issue. Would it be something happening all around the world? Airbnb please fix this and inform us about this.
The review links usually do get sent out 24 hours but there does seem to be a huge delay right now. If you cannot wait, use the Contact Airbnb link below and send a DM to @Airbnbhelp on Twitter and they will usually push it out in no time.
David
Superhost Ambassador ~ Host Club Community Leader ~ Experienced Co-Host