How to deny access for "Fire TV Stick" on "Ring Stick Up Cam"?

Dear Community,maybe it's more a "Amazon Account" / "Amazon Alexa App" question.**However... I did the following:**\> Bought a "Ring Stick Up Cam" / Created a "Ring Account" / Configured the Cam\> Added the "Ring Stick Up Cam" to my "Amazon Alexa App" (Android)\> Following devices are now in my "Amazon Alexa App" (same Amazon Account):\>\> 2\* Fire TV Stick / 2\* Echo Show / 1\* Ring Stick Up Cam**One Fire TV Stick sould NOT have access to the Cam (e. g. see Live Video).****How is this possible?**Thank you very much,Christian