For some mysterical reason Logitech is making it as hard as possible to link the Blue Logitech skill in Alexa outside US/UK. Everybody sees the famous message:
Thank you for your interest in Logitech Harmony and Amazon Alexa.
We’re as excited as you are to bring intuitive voice control to your family entertainment center; however we only support the English for the US and UK.
We’ll be sure to let everyone know once this is made available for other regions.