No sound through the ear piece speaker after replacing iP8+ screen?

I have to replace it every time, simply because that piece of adhesive never wants to come up with it. Though, I read yesterday afternoon that if you bend that spot it can cause it not to work also, but I try to be just as careful about that. Next time, I think I'm just going to be super-duper careful. Hopefully, 'super-duper' works. :)

As stated above, if the tape does not come off the old part, you can use a piece of Kapton tape to cover the solder points or try to remove the black piece of tape from the old part and stick it back onto the solder points. Not sure how you are removing the assembly. We heat up the area first then remove the assembly using a plastic spudger.

No, not 100%. I don't have issues with any of the 6's, only the 7+ and 8+. I've just decided to be extra careful and follow exactly to the T the instructions here on iFixit and it has helped some, but I do still encounter problems. I've been doing as the guy in the above comments mentions since I began repairing these model phones. I heat the area up and if the tape does not come up with the component, then I pull it up with a pair of tweezers and re-adhere it. I've never removed the front facing camera component without heat. I'm guessing it's in the way the part is made. It is extremely delicate and you just have to be extremely careful. I've been having better luck lately, but I do still encounter the problem.