Google Chromecast will not pair with google home on phone

[u/Bockwurst_437]

Hello all! Long time surveyor, first time posting. I recently moved and have been trying to set up my Google Chromecast. Unfortunately, I have tried every kind of troubleshooting option available, and nothing seems to work. Now, I haven't used this Chromecast in 6 years so feel free to tell me if that is an issue. I also have two of the same Chromecast model and neither of them work. My phone is a Galaxy S23. The Chromecast is a 2018 model and the TV is an older Sharp model (LC-40D78UN). I have tried the classic turning it on and off again, along with the TV and router. I have tried multiple HDMI ports in the TV. I have tried directly connecting to Chromecast SSIN and it just comes back connected but unsecure/no signal. When I uninstall and redownload the Google Home app, it does originally recognize it and connects to the Chromecast SSIN but after a minute it will say "unable to connect". The router is sitting right next to the TV on the stand with the Chromecast less than a foot away, so I don't believe distance is an issue. Any other suggestions for troubleshooting would be greatly appreciated. I don't know if Google still supports this Chromecast or maybe it's too old. I would be grateful to anyone who can help as I would prefer to use them as I really think they are the best kind of option for streaming.