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There's a suggestion here
https://www.amazonforum.com/s/question/0D56Q0000BZZKheSQH/phillips-hue-skill-no-longer-exists
that you need to authorise it againjust fixed the issue... apparently it was about expired authorisation. I re-authorised Philips Hue on "amazon.de" and the issue has been resolved.
The skill definitely still exists and still works. I just removed it and added it back again to test.
The device you're using to access Alexa shouldn't make any difference (unless you were inadvertently previously using a device with built-in zigbee and were actually controlling the lights that way), it's just an interface to the underlying account.
This is what I’m getting when I try to add a Hue skill
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