72 hour transit free

Hi, we fly from UK to Dubai on 1st October then fly to Beijing on the 4th October for a three day stay we will then be joining a cruise on 7th October departing from Tianjin. Our 1st port of call will be Okinawa the cruise ends in Singapore from where we will return home to the UK.The trip is fully organised by a UK Travel Company. Are we eligible for the 72hr pass or the 144day pass while in Beijing. Please advise as there are so many conflicting websites regarding this procedure.
Thank you Michael Porter