2018-05-17 UTC
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Zegnat jgmac1106, here is another test your host could try, as documented in the WP micropub thread: https://github.com/snarfed/wordpress-micropub/issues/56#issuecomment-299344751 - not a WP specific test though, just like my test file, straight up listing the received headers you can see authorization doesn’t come through.