Low Activity in PMPs Despite Multiple Setups

Hello, we've set up a good number of PMPs, but we aren't witnessing much activity. Some colleagues believe the lack of activity is due to the targeting preferences selected by clients on the buy side. However, this issue impacts every PMP deal we've set up, which is RON/evergreen from our side. I wonder if there could be a configuration problem on our end. With so many deals set up, at least one should show some spending after a few weeks. Most of these Deal IDs were shared with TTD seats. Any insights or assistance would be greatly appreciated. Thanks!