@Alabama_044 

I'm not 100% sure on this but I believe AP isolation is for isolating wireless clients only from each other.  Wireless to wired should work normally.

  @jra11500 "Wireless Isolation, sometimes called Client or AP Isolation, is a setting on a wireless router. When this setting is enabled it prevents a device that is connected to the network by a wireless connection from accessing resources that are connected to the network by a wired connection."

  @Alabama_044 

I don't know where you got that information from, but the Tp-Link User Guide for the AC1900 states the following:

"AP Isolation - This function isolates all connected wireless stations so that wireless stations cannot access each other through WLAN."

According to the user guide, the router supports the IoT Security feature.  If you want to isolate any devices, you can add them to the isolated devices list and they won't be able to access your other network resources.  With the latest firmware on other routers, the term "IoT Security" has been changed to "Device Isolation".  The original term is misleading because any device can be isolated.

  @jra11500 I mean if you look it up online 80% of the websites either say it makes it so wireless can't talk to wired or wireless can't talk to any device. That and my previous 3 wireless routers had the same setting and did exactly that. Looks like I'll be returning this router.