@ArcherC8 Thanks for your reply. I ended up following instructions here and eventually it worked (seems like I had to try it 2-3 times): https://community.tp-link.com/us/home/kb/detail/231

Archer A7 router connected to an Arris SB6141 modem. When modem is connected to the PC directly, I have internet. When I take the same cable and connect from modem to router, the Archer internet LED...