I have FTTP 500/50 at my house (in Australia), using an Eero Pro 6E router. There's a rumpus room under the house which struggles to get consistently good Wifi. For example, I might get 200Mbps in the main house and only 30-40Mbps in the rumpus room. So, after consulting ChatGPT for a while, I bought a TP-Link TL-WA1801 and some Cat6 cable, and installed the TP-Link in the rumpus room with a LAN cable to connect it to the Eero router.

The TP-Link has been set to Access Point mode, the DHCP has been disabled and the IP has been set to static with an IP Address in the same subnet as the router. The channel on both the router and AP has been left on automatic, as there is no way to specify channels on the Eero router. The AP is being powered by a POE injector that came with the device.

This doesn't seem to make a difference to the network in the Rumpus room. I tested speeds this morning - upstairs got 200Mbps, downstairs 50Mbps. I unplugged the AP and tested the speed again, with the same result. What am I doing wrong?

Side Note: If I put the TP-Link into range extender mode, it creates a new Wifi network. The new network has full speeds, however this configuration seemed to make the main/original Wifi network a bit buggy, and ideally I would rather have one Wifi network throughout the house - rather than having to switch between the two.