Also, I don't know if it's of any relevance but I always get this from the Continuity Activation Tool diagnostics:
Verifying ContinuitySupport... Print: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
NOT OK. Unknown state. Your Mac might not be compatible.
And when I try to activate I get the following:
OS X reports Continuity as active.
Print: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
Patching ContinuitySupport... Set: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
OK.
So I have no idea what the problem is :/
EDIT: For what it's worth here is the entire diagnostic followed by attempted activation.
--- OS X Continuity Activation Tool 2.2.1 ---
by dokterdok
--- Initiating system compatiblity check ---
--- Hardware/OS checks ---
Verifying Continuity status... OK. OS X reports Continuity as active
Verifying Mac model reference... OK. Known compatible Mac Model detected: iMac14,2
Verifying Mac board-id... OK. Long board id detected: Mac-27ADBB7B4CEE8E61
Verifying OS X version... Warning: This version of Mac OS X (10.11.1) is Experimental! Only partially tested on El Capitan
Verifying Wi-Fi hardware... OK. A Broadcom AirPort card is active, and is using the Continuity compatible Brcm4360 kext
Verifying AWDL status... OK. An AWDL interface is up, Wi-Fi is ready for Continuity
Verifying Bluetooth hardware... OK. The internal Bluetooth card is active
Verifying Bluetooth version... OK. Bluetooth 4.0 detected
Verifying Bluetooth features... OK. Bluetooth features are Continuity compliant
Verifying Bluetooth firmware... OK. Bluetooth firmware version: v112 c9036
Verifying Login Item... OK. Login item for Auto Continuity Check is not set.
--- Modifications check ---
Verifying OS kext protection... OK. Kext developer mode is not active. This tool can fix this.
Verifying SIP... Ok. System Integrity Protection is already disabled
Verifying ContinuitySupport... Print: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
NOT OK. Unknown state. Your Mac might not be compatible.
Verifying kexts readability... OK. Wi-Fi and Bluetooth kexts were found and could be read
Verifying Wi-Fi whitelist status... OK. Your board-id is not yet whitelisted. This tool can fix this.
Verifying BT4 dongles compatibility... OK. Compatibility with BT4 USB dongles is not enabled, this tool can fix this if a dongle is plugged in
Verifying old Wi-Fi kext presence... OK. Legacy Brcm4331 Wi-Fi driver is present. This tool can fix this.
Verifying legacy Wi-Fi card patch... OK. The legacy Wi-Fi patch is not present. This tool can fix this.
--- Modifications check ---
Press any key to go back to the main menu...
--- OS X Continuity Activation Tool 2.2.1 ---
by dokterdok
OS X reports Continuity as active.
Print: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
Patching ContinuitySupport... Set: Entry, ":Mac-27ADBB7B4CEE8E61:ContinuitySupport", Does Not Exist
OK.
Press any key to reboot or CTRL-C to cancel...