@Mario802
You can change the guest number until the day of check-in. After this date it is no longer possible. However, if you accept the reservation with only a single guest and then request a change for 6 guests you will depend on the Guest accepting this change.
So, Ideally everything should be resolved before the reservation is confirmed.
Airbnb TOS
"...
8.3.3 You may not bring any additional individuals to an Experience, Event or other Host Service unless such an individual was added by you as an additional guest during the booking process on the Airbnb Platform.
..."
Ricardo
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