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You may try to turn off all extensions except Google cast in Chrome browser. The reboot the laptop.
You need check the YouTube app or Netflix app. The casting is handled by individual apps. There are no extensions (Chrome for Android does not support extensions or apps yet).
If you want to enjoy local media (your own collections), you may check this guide: https://allaboutchromecast.com/chromecast-how-to-guide/comparison-of-5-methods-for-streaming-local-media-files-to-chromecast/
If your tablet is Note 10.1 2014 edition, you may cast the whole screen from Chromecast app, as discussed in this post: https://allaboutchromecast.com/screen-mirroring-with-chromecast/
It sounds like your TV settings issue. At least, if Chromecast is powered on, it should just like a DVD player for the TV.
Of course, if you are using the USB port on the TV, you may try the power adapter provided with with your Chromecast.
Does Netflix work on the device without using Chromecast?
Anyway, you may check with Netflix with the detailed info.
You need factory reset (method 1) the Chromecast. Please follow this guide: https://allaboutchromecast.com/chromecast-how-to-guide/reset-chromecast-factory-data-reset-fdr/
If you can cast YouTube (did you try to cast?), it means there is nothing wrong with the settings. Factory reset will not solve such issues.
You may also re-install Chromecast app to see whether you can manage the Chromecast from your device.
For apps, you may try to update them from Play store.
Google cast extension is for PC only.
For Android devices, you only need the app from Play store. If your tablet cannot access Play store, then you cannot run the app at all.
You need do it step by step. Did you finish the setup?
For that purpose, you can try a TV tuner card in PC.
Normally, you can.