Unable to share Wi-Fi passwords with one of my Macs I am unable to share any Wi-Fi passwords to one of my Macs.

AirDrop works to share photos / files / web pages
Handoff does work for Safari to hand off an active page
Sharing WiFi passwords certainly does not work at all


Let's call the affected Mac &quot;Mac A&quot;. I am able to share passwords from my iPhone to &quot;Mac B&quot; and I am also able to share passwords with other contacts from my iPhone. I am able to share Wi-Fi passwords from &quot;Mac A&quot; to my iPhone, but not the other way around.
When I try to share a password from any device (but using my iPhone as an example) to &quot;Mac A&quot; the iPhone says &quot;Sharing&quot; for about 30 seconds and then shows &quot;Password Not Shared&quot; &quot;There was a problem sharing your Wi-Fi password.&quot; I've added a screenshot of the error, just in case that's of use.
I've tried to fix this by:

Signing out of iCloud on all of my devices
&quot;Forgetting&quot; Wi-Fi networks from all of my devices
Restarting all devices
Sign in to iCloud on my iPhone
Connect to my home Wi-Fi network from my iPhone
Connect &quot;Mac A&quot; to the internet via Ethernet
Sign in to iCloud on &quot;Mac A&quot;
Disconnect Ethernet
Attempt to connect to my home Wi-Fi network on &quot;Mac A&quot;
Performed a reinstall of macOS on &quot;Mac A&quot; (using recovery mode)
Erased &quot;Mac A&quot; and performed a clean install of macOS

However, I get the same error. I've also tried resetting &quot;network settings&quot; on my iPhone and then going through the above steps, but that didn't change anything. I kind of didn't expect this to help as the issue appears to be with &quot;Mac A&quot;.
I don't know what else to try next with this. Does any one have any ideas on what to try?
I don’t have a fix, but I know this has come up. Also, this is going to be very hard to reproduce your conditions, so it might be a while to solve this. Here’s how I would troubleshoot this, based on a layered approach:

Make sure AirDrop works bilaterally - photos / web page - share back and forth.
Make sure Handoff works bilaterally - safari and messages are good to test
Make sure WiFi handoff works - this uses Handoff to store an item in Keychain / System Preferences

So, for most people, I would expect handoff is the broken piece here and not that the keychain or system preferences app are broken for you.
Also - when A/B testing, it’s very useful to have a C to test - iPhone / iPad or another Mac.
Good luck - with so many variables, you may need a piece of paper or spreadsheet to test the various apps in the various configurations, but WiFi sharing layers on top of handoff which layers on top of AirDrop with iCloud identify certificates to allow Handoff to work. Hopefully you can eliminate iCloud as a cause by signing out and in, but clearing the keychain of signing / identity certificates might be needed - especially if iCloud syncs these down to the Mac A after you erased it.