My last two flights have been in a Cirrus SR22TN. I wasn't able to get a squawk code for either one. The first time I logged in as airplane code S22T (the proper ICAO code for this aircraft) and I thought maybe that designation is not in the POSCON database, so today I entered as an SR22, which I chose from the dropdown. I never got a squawk code for either one. Is it something about the Cirrus, or is it just me being an old guy and missing something obvious? Thanks in advance for your help.