Chromecast no set up and can not be reset

[Mervyn]

I use a Chromecast device on my TV. This has worked fine untill I accidentally removed the TV from my Home app. Indeed, TV is no longer visible in my Home app, but the message "Install Chomecast" is now present in the app. I tried to do that, the candidate "TV" is correctly shown and the app can connect to it. Next step is connecting to my WiFi. That fails with a message like "Another user has set up this device" (after translation) and I am closed out without any option to go further. I have disconnected and reconnected power of the Chromecast device but that doesn't help. I can not factory reset as it says there is a problem and can't do it.

[NestHub1Gen]

Try to press the reset button on the Chromecast. What for gen you have? If you removed it, try to set it up again in the Google Home app or try to Update the app in the Google Play Store/App Store. If that is not the case, you will simply reset it by pressing the reset button. Press the button and hold it for 10-12 seconds until the screen shows that it is resetting. The LED should start to blink yellow. When the LED light turns solid white, release the button, and the device should then reset.

[JoeDickens]

same issue facing