iPhone 8 Taptic Engine replacement only vibrates with home button

I recently gotten inside my phone and replaced my iPhone 8’s battery, loudspeaker and earpiece. While doing that, I had accidentally ripped the Taptic Engine’s ribbon cable, rendering the part unusable. The phone worked fine without the engine, but there was no vibration, whatsoever. I had then proceeded to order a replacement for the Taptic Engine, put the new one in, and turned my phone on. The haptics for pressing the home button work perfectly fine, but all other haptic feedback doesn’t work for the phone at all still. Is there anything I’m doing wrong?

Something of note here is that I’ve been looking across the web for solutions for this, and it seems that I may need to transfer/write the serial number of the old Taptic Engine to the new replacement Engine digitally using some kind of small device that typically only people that repair phones for a living have access to. They aren’t super cheap, either. If this is the case, why isn’t this reflected in the replacement guide? (Or any of the Taptic Engine replacement guides for that matter) I bought the replacement engine with confidence that I wouldn’t need anything extra to have it work again.