My network has a TP-Link Archer C7 as a router connected to the ISP and a TP-Link Archer A7 configured as an access point connected by cable to the router. Both support 2.4/5GHz with main and guest SIDs for each band, and both have been configured with the same SIDs to support convenient roaming between.
My desktop is cabled to the access point. I have an IP camera connected via WiFi to the router. What would explain why my desktop cannot ping the camera on the router? If I WiFi connect that camera (or any other camera) to the access point, my desktop can ping it fine. My phone has an app that can connect to these cameras and it can connect to all four cameras regardless of whether they are connected to the router or the access point.
When I use the Tether app (provided by TP-Link), all of the devices connected to the access point (whether cabled or WiFi) appear as cabled devices under the router. I admit that, while I have general networking experience, I am new to access points so maybe there is some configuration I need to adjust?