We subscribed to YouTube Pubsubhubbub to get notified if someone posted a video on the channel. If we try to view our subscription details or subject URL details through https://pubsubhubbub.appspot.com/ , everything will be displayed as "Transient Error" and the server will return a 503 Error. And there seems to be an error with every topic-url I'm trying. However, our theme URL, if it opens in a browser, shows the content, so it seems to be correct. ( https://www.youtube.com/feeds/videos.xml?channel_id=UCyjzn-6YZur2M-qVwTzbQGA )
This worked for several weeks, and yesterday we tried to subscribe to another channel, and now this error is everywhere. Even our old subscription will no longer receive push notifications, and the old page URL also returns an error.
Does anyone know where the problem is? Or has the same problem?
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