I signed up for Miles and Smiles and put in the PNR number to try to get seat assignments for the Turkish Airlines segments on a purchased United Around the World Business Class Fare with two tickets on one PNR. On both the APP and the website it asks for the ticket number beginning in 235 before I can select seats. I only have the United tickets numbers beginning in 016 and it will not let me enter them contrary to JimInOhio experience. I have called TA three times and United four times and no one can give me the 235 ticket number or help get me two seats assigned together. All other segments on various Star Alliance partners I was able to get seats. Any ideas?