Can't connect to Chromecast after iOS17.2 update

Hi there, I can't seem to reconnect my Chromecast since my iPhone as been updated - I keep getting this message (see attached picture) and I don't know what else I can do? I've already tried a factory reset of the Chromecast twice; restarted my iPhone; restarted the wifi; the Local Network privacy settings are turned ON already so....I'm really stumped!! It was literally working 3 hours ago and then we had a wifi outage and I haven't been able to reconnect it since then. The only thing I can think of is that it has something to do with the recent update as I've been having other issues with other apps since then....

Any ideas of what I can do appreciated.

Kelly.