I just thought to check in on this topic. As I mentioned in my report I did a hard reset of the device each of for each of the attempts with no change in the end result. I will go through the motions this morning.
After the hard reset this morning the Chromecast seamlessly signed on to the network then downloaded and installed an update. It then set up normally.I had no intent of replacing a device that worked other routers, waiting payed off.
I see there is an option that I had to check to receive an email for someones reply to the post.
I haven't able to connect my BlueCurve Chromecast app to my Chromecast, the only streaming app to ever not able to do this. It's mid 2020 when are you going to catch up ?