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