How do I get an RSS feed to work

You seem to have an invalid feed.
There’s a <center></center> tag at the beginning opening the file instead of <?xml version="1.0" encoding="UTF-8"?>. You need to fix that.

I don’t know where that comes from, probably from some post being not well formatted, or from some plugin or your theme.

Try disabling all your plugins and then reactivating them one by one to see which one might cause the problem. If not, try to change theme and see if that works.

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