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.

Reinstalling OS X Lion issues - Apple Community

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This item is unavailable

FixMeStick Computer Virus Removal Stick for Apple Macs - Unlimited Use on Up to 3 Apple Laptops or Desktops for 1 Year - Works with Your Antivirus : Electronics

I accidentally deleted my mac hard drive and my mac won't work

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This item is unavailable

This item is unavailable

Maxon Services Unavailable – Knowledge Base

Temporarily Disable Login Items in Mac OS X