Please upload a debug log and post just the token that is generated after the log is uploaded by running the following command from the Pi-hole host terminal:
*** [ DIAGNOSING ]: Networking
[✗] No IPv4 address(es) found on the eth0 interface.
DHCP packets received on interface wlan0: 1
PIHOLE_INTERFACE=eth0
You configured Pi-hole to listen on eth0 but there is no working network connection on eth0. But it seems you have wifi connection. Run pihole -r and choose reconfigure to change the interface.