What country are you in? If you're in a non-official alexa country, just set your account to US (or make a new one), including a US address on the website under devices/settings (!!), and set your own adress in the alexa app for local weather and stuff. Then you have basically all skills (except local stuff).
Another problem with the harmony skill might be that you need to have the harmony app in english, your phone language, everything. Apparently Logitech thinks only users in UK/US use a harmony hub.....
So if the above doesn't fix it for you, follow these steps:
* Amazon account set to US (including that address on the amazon website, very important).
* Telephone set to language US, Time -5, location off.
* US logitech account based on a gmail account.
* Logitech Hub configured based on this gmail account.
* Logitech account in app set to UK.