HTTP 553 error on subscription

I’m trying to fix a problem with one of my subscriptions. NewsBlur has the URL for one of my subscriptions with an unneeded suffix (correct URL: http://wydaily.com/feed/, NewsBlur’s using http://wydaily.com/feed/?_=6544) and getting a 553 error. I can’t figure out if the problem is because of the parameter or not. I can view the feed just fine in my browser.

Could they be blocking NewsBlur?

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