Xcode 12.1 cannot install to iOS 14.2

Developer Tools & Services Xcode Xcode

robnotyou OP

Created Nov ’20

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After the macOS 10.15.7 update, Xcode showed "Install Additional Components", so I did that.

Now I find that Xcode can't install to iOS 14.2
It says:
"{phone} is not available. Please reconnect the device."

Tried:

Disconnect/reconnect
Restart (all devices)
Different phone (also iOS 14.2)
"Empty the Derived Data" folder

I know there is a downloadable Xcode 12.2RC, but I prefer to stick to the App Store version on my main Mac.
Apple say: “The term “Release Candidate” (RC) replaces “GM seed” and indicates this version is near final.”
"Near" final?!

Is there a timing SNAFU here?
Surely the release versions should all line up, and work together!
Should Xcode 12.2 be available on the App Store, to go with iOS 14.2?

Answered by robnotyou in 646043022

Xcode 12.2 is now available on the App Store.

Apple didn't reply to my Feedback Assistant submission, perhaps preferring to run out the clock.
After an awkward 6 days, this issue is now resolved.

Until next time...?

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