@karen+lerigo
If the router has such a thing, it will be printed on the label on the router itself.
WPS PIN setup has been known to be inherently insecure for at least a decade though, and really shouldn't be in use.
https://www.kb.cert.org/vuls/id/723755
https://www.cisa.gov/news-events/alerts/2012/01/06/wi-fi-protected-setup-wps-vulnerable-brute-force-...
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
