Hi,
I had the same problem - but you can actually revoke your Alexa access to your Hue bridge using the web based CLI:
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Get the IP address of the bridge: https://www.meethue.com/api/nupnp # on your home network
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Login here: hue bridge ip/debug/clip.html
3a. in the URL: box just have /api
3b. in the Message Body box type: {“devicetype”:“my_hue_app#iphone peter”}
3c. Press the link button on the bridge
3d. Click “POST” back in the web browser.
3e. After you click POST, you should get a new authorized user. It’ll be a long string like, 8234a4617d04da72f3331aa551d2dc. Note this down and use it where I have put your auth code
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In URL box type: /api/your auth code/config/
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About 13 lines down, you’ll see the whitelist…all the apps that are authorized to access the bridge. Somewhere you’ll see “Echo” as a name
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Get that long alphanumeric string above it (it’ll look like: f6SEmYj6FMGSq5aRqaP4jPO6YaHbbddAzhBjo2qnD
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In the URL box type: /api/your auth code/config/whitelist/long_alphanumeric_hash_here
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Press DELETE. You should get a “success” message