I had the same issue this morning. Updated to IOS 14.0.1 on my Iphone 6s and can't use the wifi even though the icon was on. Called Apple for support and nothing can be done.
Later I watched a video online and that trick works on my phone : click to the blue! icon on the wi-fi, then turn off the private address. Waited couple of minutes afterwards, then I was able to use my wifi as usual. Hope it helps!
Euta
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