OK, I finally bought myself an OBD USB adapter, installled Forscan on my laptop and ran it on the 2017 C-Max Energi. It reports the TCU configuration shown in the attached screenshot. As previously noted, I had a 4G modem installed by a Ford dealer on January 11, 2022 and it was activated on FordPass on January 16, 2022. I should know in a few days whether the value charge features are now working or not. I hope this information is helpful to someone.