internet NO connection despite hardwired ethernet

I’m trying to configure a new RPI 3B, and I can’t get it to connect to the internet. It’s (obviously) available via ethernet, and anything else on the ethernet has internet access, including a RPI 4 I tried (and yes, same ethernet jack and cable… same, same, same everything).

I’ve tried various resets, reboots, power cycling, etc. No joy. I’m kinda out of ideas. I’d be GRATEFUL for any ideas!!!

Here are some specifics:
RPI 3B V1.2
Maxplay V2.49 (the latest version I think)

#### FILESYSTEM ####
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 14950788 2204664 12109796 16% /
devtmpfs 443608 0 443608 0% /dev
tmpfs 448216 0 448216 0% /dev/shm
tmpfs 448216 36016 412200 9% /run
tmpfs 5120 4 5116 1% /run/lock
tmpfs 448216 0 448216 0% /sys/fs/cgroup
/dev/mmcblk0p1 42136 22498 19638 54% /boot
tmpfs 89640 8 89632 1% /run/user/1000

#### LOAD AVERAGE ####
0.07 0.04 0.00 1/207 24649

#### KERNEL ####
Linux livingroom 4.19.30-v7+ #1209 SMP Tue Mar 26 13:14:20 GMT 2019 armv7l GNU/Linux

#### LINUX-VERSION ####
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.8 (stretch)
Release: 9.8
Codename: stretch