Thanks, @georgiahost. No idea how I’ve missed seeing it all along.
My check-in guide key is gone now, too.
It was still there the last time I booked a guest on the platform a few days ago.
Of all the things that could use breaking on AirBnB, this wasn’t one of them!
One star! Very disappointing! 
Maybe I need to save the link now, before mine disappears too! 
Mine disappeared at the same time too. I received a notice from airbnb that they will now automatically send the check in link to the guest, but they are not doing it and airbnb doesn’t seem to understand my problem.
I did just figure out a solution. I went to one of my past reservations in which I was able to send a check-in link. I copied the link and saved it to my notes.
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