Could be due to a few reasons. I highly recommend that you follow this guide if you haven’t done it so far: Setting up a ShotGrid Project to Work with Unreal Engine | Unreal Engine 4.27 Documentation
Could be due to a few reasons. I highly recommend that you follow this guide if you haven’t done it so far: Setting up a ShotGrid Project to Work with Unreal Engine | Unreal Engine 4.27 Documentation