You are using one of the workarounds for the Pixel. It will not cast directly to a TV unless the TV has a built in Chromecast. Or you can use a janky third party app.

With my TV, iPhone works perfectly, laptops work, desktops with Bluetooth work, but a Pixel intentionally has casting disabled. It is stupid to disable this, and borderline fraud.

https://deviceverge.com/how-to-cast-google-pixel-to-tv/#1_Can_I_cast_my_Google_Pixel_to_any_TV

1. Can I cast my Google Pixel to any TV?

Yes, you can cast your Google Pixel to any TV that is equipped with a built-in Chromecast or has a Chromecast device connected to it. To cast, make sure your Pixel and the TV are connected to the same Wi-Fi network. Then, simply open the content you want to cast on your Pixel, tap the cast icon, and select your TV from the list of available devices.

If your TV doesn’t have built-in Chromecast or a separate Chromecast device, you may still be able to use a streaming device like a Google Chromecast or a Roku Streaming Stick. These devices can be plugged into your TV’s HDMI port, allowing you to cast content from your Google Pixel.

2. How do I cast my Google Pixel to a TV without Chromecast?

If you want to cast your Google Pixel to a TV that doesn’t have built-in Chromecast or a separate Chromecast device, you can use a third-party casting app or device. These apps and devices work similarly to a Chromecast, allowing you to mirror your Pixel’s screen or cast specific apps to your TV.

One popular option is using a streaming device like a Roku Streaming Stick or an Amazon Fire TV Stick. These devices often have screen mirroring capabilities, which can be used to cast your Pixel’s screen to the TV. Additionally, there are third-party casting apps available on the Google Play Store that can help you cast your Pixel to a TV without Chromecast.