I have this setup:
-internet connection from a smartphone acting as hotspot;
-desktop PCs (manjaro gnome 3.34) connected to the smartphone via WIFI;
-a raspberryPI modelB (latest raspbian) connected to a PC via ethernet.
Rpi and PC can see each other in LAN and I can even login via SSH.
When I want to join the internet from RPI through the LANned PCS, I have no access (RPi WIFI is not an option).
I only tried changing dhcpd.conf in RPI and set a basic static profile, eg: