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No arrival day restriction
No way I can find the "No arrival" day restriction.
It is definitely in the tutorial about restrictions but I can only find Minimum days of stay and Minimum days in advance for reservation.
Any clue? Is there a place where you activate these restrictions??
Contact booking.com help team using Inbox icon on Extranet (Option booking.com messages) and ask them to open up the lines or give them a call see link for local phone numbers.
https://partner.booking.com/en-us/help/where-you-can-reach-us