TL-SG105E smart switch
Recently had cat 6 cabling done to new outside office. Planning to link it to my in house router. Have been told by ISP the router has only one operational port, despite being 3 others on it, so they have sent me this switch to attach to router. Have linked router to switch port 1, then linked my home wi fi booster to port 2 to enable my in house wi fi. All good so far, wi fi good and strong BUT no success when linking the outside office by cat 6 cable to port 3 of switch, just showing no connection out there in office when viewed on ethernet to laptop. I know the cabling is all good as I removed the home wi fi booster from the router and just ran the office cable off the no1 router port without the switch and it worked. But I need both in home wi fi and the office ethernet working simultaneously. What am I doing wrong ?