Not an RSS feed (553) on NewsBlur only

I have a private feed to https://stratechery.com which has been problematic on NewsBlur for the past few days. The “Statistics & History” window shows that it’s been throwing exceptions (Not an RSS feed (553)) since 2019-06-25 10:58:16.

However, the exact same feed works locally on my computer, as well as on Feedly and Inoreader.

trying to validate it might give some clues.

https://validator.w3.org/feed/

Thanks! I just tried that. Here’s the output:

Doesn’t look like there’s anything major though.

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