Hello! Perhaps if you gave us the name of the items you're trying to sell, we could see if there was an issue. Notice that some items are marked as "No Auction" (shown on the detail view of an item when you hover your mouse over it) and cannot be sold to Harvey in the Bazaar. These will need to be sold to a vendor. In some other cases an item may also be marked "No Sell," this is the case with the Pioneer's Eyepatch.
There are some cases where Harvey will not buy an item for as much as you would get from a Free Trader. From the Update Notes: "Now that he has ample inventory in his store, Auctioneer Harvey Deuce is changing his buying prices to respond to supply and demand. Once Harvey has 100 of any item in stock, you may find that you get better value from other vendors. Harvey will continue to pay significantly more for items that are in shorter supply."
The bazaar seems to be functioning currently, as I just sold a couple of items to Harvey myself. Can you provide more detail?