There could be several reasons. Maybe they don't have the rights to air it this year. Or perhaps they have chosen to focus on other programming during the Christmas season.
You can check other channels. There are often multiple networks that show Christmas movies during the holiday season, so it might be on another channel.
The airtime of A Christmas Story on TBS can vary from year to year. Usually, it's shown during the Christmas season, but the specific date and time could change. Keep an eye on TBS's programming announcements.
It's hard to say. Sometimes their programming changes, so it's best to look on their channel or online listings to see if they're airing A Christmas Story.
The time when A Christmas Story is on TBS isn't fixed. Sometimes it's in the morning, sometimes in the evening. You'll have to look at their current schedule to know for sure.