Nest cam casting issues


I need help. I just installed two nest cams which are working great. I've linked my accounts and I can see the cameras in my google home app, but when I try to cast the video to my tv via chromecast using the suggested promt "ok google show me 'camera name' on 'chromecast'" or "what's on yada yada yada" it always just starts playing youtube videos with said names. I've tried renaming the cameras but that doesn't help. what am I missing/doing wrong?