Hiya @APacker and Welcome to the Cuckoo Community !!!
Out of interest is your Chromecast synced up to your Cuckoo Router as I’m guessing your a customer at this point and what error messages do you have on screen when you try to cast between devices.
There was an issue after a lot of troubleshooting with an early access customer who engaged with me and we found that there Chromecast was an older model and as such didn’t like the 5GHZ Band that the Cuckoo Router outputted so delving into it between me and the customer we split the WIFI Channels down and disabled the 5Ghz channel and Band Steering and from that point we rescanned and linked up to a solo 2.4Ghz channel and as far as I know there hasn’t been any issues since…I’m not saying that’s the same for you but is a place to start.
If your unsure how to do this just reply to this message with a screenshot from your network devices tab from the router on 192.168.1.1 from a blank browser window & also if you can also advise me of the model number of your chromecast or take and upload a picture on here.