Have you put both products into Bluetooth pairing mode, as shown here in the below YT video (around 9m-15s into video). Not the exact same TT, but presumably it’s similar? They also need to be within a few feet of each other to BT-pair (as also mentioned in the video)…
If still no joy - try power cycling the products too and if the problem persists then it maybe best to reproduce the failed-pairing issue and then immediately submit a Sonos system diagnostic report from within the Sonos App, note it’s reference and then contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to resolve the matter.