Under the position "Mobile" -> "SIM & Devices". You can see that for the German version here:
https://community.swisscom.ch/t5/Archiv-Telefonie/Wie-finde-ich-den-Puk-code/m-p/493867$
or try this:
https://www.swisscom.ch/myswisscom/d?useCase=viewPuk
And if you still don't find it, please call the Hotline 0800 800 800. It doesn't make any sense to place the same request for several times here.
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