Windows licencing woes

[RizzoTheRat]

My PC used to be on Windows 7, when I upgraded to 10 I did the upgrade, got the licence key, downloaded a Win10 Home install from Microsoft, then wiped the system and installed a fresh version of 10 using the licence key.

Managed to break something recently and after system restore failed to run I did the full recovery which supposedly leaves you with a vanilla windows install.

However it now won't activate. Settings-Activation says "We can't activate Windows on this device because you don't have a valid digital licence or product key"

Running the troubleshooter says "We found a Windows 10 Home Digital licence for this device running Windows 10 Home, to activate the digital licence you need to install Windows 10 Home."

System Info says I'm running Windows 10 Home and downloaded a tool to extract my licence key and it does have the correct key installed.

Any ideas?

[RizzoTheRat]

Will it download all the updates if it's not registered? Hunting around the net I found a few instances of people saying it can take a while to register, so I guess it's worth leaving it a few days before trying phoning MS, only reset it on Saturday.