Yo @TeamYouTube, why can’t I livestream on my channel???pic.twitter.com/Ryfvkv5Ltc
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We've just heard back from our team. Since your channel have received content ID claims your ability to live stream will be enabled only after your Content ID claims expire. Hope this helps clarify.
How long until it expires?
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.