Universal Clipboard working only one-way between Mac and iPhone 7 Plus.

Hello. Is anyone else having this problem? If so, how did you fix it?

First, I'm not sure whether this would be considered a Mac or an iPhone problem so I'll start here and re-post if necessary.

Universal Clipboard, and occasionally Handoff, does not work reliably or consistently between my MacBook Pro and iPhone devices.

If I am copying from the iPhone to the Mac (iPhone => Mac), it works 9/10 times; however, if I try to copy anything from the Mac to the iPhone (Mac => iPhone), it does not work, and one of three things happen:

1. App will do a long pause, then do nothing.
2. Offer the option to Paste but the paste is old data, not what was in the Clipboard to begin with.
3. Do nothing.

Conversely, the iPhone and iPad both work seamlessly between each other with no issues using Handoff or Universal Clipboard (iPhone => iPad or iPad => iPhone); moreover, the iPad works seamlessly with the Mac (iPad => Mac, and Mac => iPad). The only hangup so far is between the iPhone and the Mac. I have tried the following troubleshooting steps (not necessarily in this order), and have not reached a solution.

1. Reboot all devices, including the network router.
2. Reset Network Settings on all iOS devices.
3. Turn on/off Airplane Mode
4. Sign out/in to iCloud
5. Restore the iPhone as a new phone.
6. Reinstall macOS Sierra

Incidentally, I've also tried toggling off/on Handoff on the Mac as well as with the iPhone, and it had no effect.

Many thanks, in advance.

15" MacBook Pro mid 2015 (Current generation model) with Mac OS Sierra

IPhone 7 Plus with iOS 10.0.2

IPad mini 2 also with iOS 10.0.2

Apple Airport Extreme 802.11AC