Solved! This Item Is Temporarily Unavailable While Reinstalling macOS

This post provides some methods to fix the error this item is temporarily unavailable on Mac, which pops up after entering Apple ID to reinstall macOS.

Solved] An Error Occurred While Preparing the Installation

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503 Service Unavailable Error: What It Is and How to Fix It

HP printers - 'Scanning is Currently Unavailable' displays in the

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Reinstalling OS X Lion issues - Apple Community

How to Reinstall OS X Lion: 4 Steps (with Pictures) - wikiHow

Mac Installation Errors You Encounter and How to Fix Them