Remove non-existent devices from "Calls on Other Devices" on iOS? On my iPhone 8 running iOS 12.1, under: 


"Settings / Cellular / Calls on Other Devices",
"Settings / Phone / Calls on Other Devices", 
"Settings / Messages / Text Message Forwarding"…


…I see two list items for test macOS user accounts I created and deleted in troubleshooting another issue. 

These two non-existent devices don't appear in the list of devices: 


at the bottom of "Settings / Apple ID",
on https://appleid.apple.com/account/manage, 
on my Mac under "System Preferences / iCloud / Account Details / Devices". 


I've tried toggling the faux devices, toggling "Calls on Other Devices", and rebooting the phone and the notebook. 

I assume now, in retrospect, that I should've logged out of iCloud on the test macOS user accounts before deleting them (including their home folders), but I'm pretty sure now that's no longer an option. 

Any help?
I had an iMac showing twice within &quot;Calls on other Devices&quot; on an iPhone
The following got it fixed for me.

Removed my iMac from the iCloud account
Logged into iCloud again on the iMac
Logged in FaceTime on the iMac
Switched off/on &quot;Calls on other Devices&quot; on the iPhone

Hope this helps