Display WordPress Posts: An error occurred fetching the remote data

I’m trying to get this widget working to show posts from the other blogs in my network. All of the sites I’m attempting to pull from are on the same install but use domain mapping for their own URLs. All of them are individually running Jetpack, which is connected to WordPress.com.

I’m able to get the widget to work for 4 sites, but the other 5 give me this error:

An error occurred while downloading blog information:
An error occurred fetching the remote data.

Detailed information:
Forbidden

Even though the sites are on the same theme with the same plugins, I’ve tried changing the theme and disabling the plugins, to no avail. I’ve tried disconnecting those sites from Jetpack and reconnecting. I’ve run the debug on each of them and got “Your Jetpack setup looks a-okay!” I’ve loaded the XMLRPC file on each and it shows the correct message (“XML-RPC server accepts POST requests only.” on a line by itself).

For a specific example, the widget pulls from schoolofdoubt.com but not from madartlab.com.

Since all the sites are on the same install, they’re also all on the same server (at WPEngine). They also all have Cloudflare protection with the same settings.

I’ve searched through the forums here and elsewhere and I’m at the end of my rope. Anyone have any ideas?

Thanks!

https://wordpress.org/plugins/jetpack/