How do I get hand off to work iMac/iPhone

I was having Handoff trouble and I was following a thread from January 2018.

the poster couldn't make handoff work and followed these instruct from Apple

Set up Handoff

Use Handoff with any Mac, iPhone, iPad, iPod touch, Apple Watch that meets the Continuity system requirements. Handoff works when your devices are near each other and set up as follows:

• Each device is signed in to iCloud with the same Apple ID.
  To see the Apple ID used by Apple Watch, open the Apple Watch app on your iPhone, then go to General > Apple ID.
• Each device has Bluetooth turned on.
• Each Mac, iPhone, iPad, or iPod touch has Wi-Fi turned on.
• Each device has Handoff turned on:
  • On Mac, choose Apple menu () > System Preferences, then click General. Select “Allow Handoff between this Mac and your iCloud devices.”
  • On iPhone, iPad, or iPod touch, go to Settings > General > Handoff, then turn on Handoff.
  • On Apple Watch, open the Apple Watch app on your iPhone, then tap General and turn on Enable Handoff.
    Apple Watch supports handing off from watch to iPhone only.

If those settings are correct, I recommend turning them off on each device, then restarting the devices, and then turning them back on and testing. Thanks and have a wonderful day.

That was all good and I did it several time to no success UNTIL I turned off my iMac and my iPhone and restart both.

Then it worked>

That is not in the instructions and should be. Good luck Handoff Troubled people