We never used or added "check-in instructions". We always send the check in instructions through messages because we have to update codes and passwords. My last 3-4 guests received wrong codes and instructions that we never set.
My guest sent me a screenshot from where they got this from, and there was the following:
"How to get inside"
Some Helpful Details from your Host
Then an old check in message that we sent to previous guests with all the wrong instructions.
I am a super host, so I called AirBNB Support but they don't know how to fix it. Using the APP there is nothing on the "Check-in Instructions" .