XenForo Push notification failure: cURL error 6

[Bluemoon]

Over the past week, I've started getting a lot of these errors in my error log (around 25 a day). Any idea what is causing them, and how I can resolve it?

Code:

ErrorException: Push notification failure: cURL error 6: Could not resolve host: permanently-removed.invalid (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for...

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