hello James,
if it doesn't work, it can only mean that you didn't do it well enough. I suggest you disconnect everything again and try to do it more carefully this time. I mean the efficiency of connecting the DOCK flex tape to the phone's motherboard, the Taptic engine port and the loudspeaker. Additionally, check if you did not damage the protruding piece of the microphone tape by removing the adhesive tape from under the battery -> it sticks out slightly below the battery. Most often, however, it is the problem of connecting the connector in the port.