Archer A8 has no "virtual server" for forwarding ports.
All of the directions to forward ports on this TP routers require the use of a setting called Virtual Server. However, the Archer A8 has no such feature, and there is no documentation on how to do this correctly. I normally do not look to posting in forums, but there is an excessive amount of information on how to set up every other router except for this model. I simply need to set up a few ports to attempt to solve Xbox One port problems for a couple games. There are additional settings under non-virtual port forwarding that need configuring, but I'm at a loss for searching the web for this info.