This means that changes (to certain values like language, latitude, longitude) are not permitted because you have already put the property online. If you want to change anything now you have to contact your account manager at Booking.com and ask for the property to be reviewed again.
'''Message thread not found'''The Booking.com connection for the property does not allow the use of the messaging API.
Please log into Booking.com and and go to ACCOUNT > CONNECTIVITY PROVIDER. Disconnect from Beds24 and reconnect this time ticking all tick boxes as shown here: https://wiki.beds24.com/images/6/69/Extranet-booking.png