I purchased a Roku Express on 22 June 2021 from Amazon.de (Germany) and sold by Amazon.de. The Roku Express became available on Amazon.de in November 2020. Clearly displayed in the photos below of the Amazon.de webpage, the About this item description, states:
Genießen Sie Live-TV, Nachrichten, Sport, Filme und TV-Episoden auf Tausenden von kostenlosen und bezahlten Kanälen wie Netflix, BBC iPlayer, ITV Hub, All4, Disney+, Prime Video, Now TV und viele mehr.
Enjoy Live-TV...Disney+,Prime Video, Now TV and many more.
Under the heading Supported Internet services it lists Netflix, Amazon Instant (Prime) Video.
There are photos highlighting the Roku product and prominently displaying the Prime Video logo.
It's interesting that a major retailer is selling it in Germany, but all the images show English, and the Country selector on the Roku website, doesn't have Germany as an option. I also see that someone asked on the Amazon page if it works in Germany and the answers are that it does not. Were the box and the instructions in German? I think Amazon has gotten so big that it doesn't really know what it's selling some times.
I live in Belgium, and I was glad to find a Roku device on Amazon.FR
I installed it, got access to Spotify, Netflix, Youtube and Apple TV - but I can't find the Disney+ and Amazon Prime applications on the Roku store. These apps are available in Belgium as I am a suscriber and they are available on my Apple TV in the living room.
Thanks for letting us know about the issue you're experiencing.
Please be advised that you can activate any Roku Player or TV to any Roku account, however, channel availability/access will vary from region to region. Channels that are currently available in any given region are certified for the Roku devices sold in that region.
For more information, you'd want to contact any specific channel/service provider to inquire further about which Roku devices they support their channel (app) on in your current region.