Since I did go over this in another thread I’m going to copy/paste it here, with some minor adjustments.
In order to help combat the Real Money Trade some restrictions were implemented that require accounts to have paid for at least one month of game time before they’ll be able to use some of the trading features.
Some of the philosophy behind this was posted about here, if interested.
The effective date for purchased game time to count for this is November of 2017.
The restrictions should lift after the 26th day from when the game time was purchased. Sorry for the inconvenience.