A:Answer Hi, Customer!
Power reset the soundbar and the subwoofer by unplugging it from the power source for 60 seconds. After power reset, move the subwoofer closer to the soundbar. If the light indicator turns green meaning The subwoofer is connected to the Bar Speaker without Secure Link. Try to link the subwoofer again to the soundbar. For details, see page 20.
https://www.sony.com/electronics/support/res/manuals/4688/46882521M.pdf
Happy to help,,
David