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You can just install Home Assistant on whatever hardware you have spare and set it up that way. There may be a lot of messing around with port forwarding and certificates and Amazon accounts and stuff though.
I think the easier solution would be to just work out why it isn't working on your current setup. Have you moved country by any chance? Are you sure you're on the same account (after some time recently troubleshooting why my dad's kindle books weren't showing up on all of his devices he happened to mention that he had two Amazon accounts ...)?
@Velocio, Are you using Home Assistant already? Do you like it? Interesting read btw, thanks.
From what I can tell now from their website, in order to solve my current challenge I'd have to get the HA Yellow unit and subscribe to their cloud service in order to make it work with Alexa correct?