@hodermann Let’s try this is an isolated environment first. Take the following steps one-by-one, do not connect to AT&T router (for now). Actually, it’s better that you do this away from the AT&T router.
1. Disconnect all cables (LAN, WAN, power cord) to the router.
2. Connect the power cable ONLY and wait for the router to power up. I expect the SYS LED to be solid on. WLAN should be on too (if not, don’t worry about it for now).
3. Keep the router powered on, press the Reset button (next to the power connector) with a pin or pen tip, hold for 10 seconds. Then let go.
4. Wait for a few seconds, all LEDs should blink once (this is important, do you see it?). The router will reboot after that.
5. Wait for the router to power up, SYS and WLAN should be on.
After step 5, you should be able to see the pcwrt SSID.