Cast symbol gone on Twitch?

Have the following problem:

I saw the cast symbol in the Twitch app for the first time yesterday and have been waiting for it for ages because it can help me a lot.

Today I wanted to use this and noticed that the symbol can no longer be found. Is it gone with you too? Have you ever had it for a short time?

Attached is a photo of the symbol. It's been a long time on YouTube and Netflix and I use it very often.

Always make sure that the devices are in the same network (W-LAN and LAN). On YouTube you can also find a TV code in the settings on the television, which you can enter in the settings on the mobile phone. Unfortunately, I don't know if that works on Twitch.

Does this mean that if Twitch does not display the symbol, there are no devices in the same network that are suitable for this function? My television is shown on YouTube and can be used for this; However, not via the iOS Air-Play function, as the TV is a bit older. Can it have anything to do with it?

This can be related to it, but it can also be that Twitch does not provide this function at all.