@YouTube casting video from my phone to TV I am getting error about streaming device limit. This seems wrong. 
Just to confirm, are you trying to cast from an android or iOS? Also, share the screenshot of the error message and we'll take a look.
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Thanks for sharing the screenshot. We recommend you to change your account password which will automatically log you out from all the devices you are logged in to. And try casting again to see if that changes anything. Let us know.
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