hey guys, we’ve just noticed this issue too, got the following response from Pantheon. pretty gobsmacked by this, we’re using Yoast which is probably the most used WordPress plugin and it doesn’t work, and displays no errors.
From Pantheon:
It is possible to use the plugin, the difference being that on Pantheon the only writeable location on server is wp-content/uploads/.
You can thus create a symlink to point https://www.colt.net/some/path/to/sitemap.xml to wp-content/uploads/. I’ve pasted an article on how to achieve this below.
Non-Standard Files Locations – https://pantheon.io/docs/articles/sites/files/non-standard-files-locations/
If you have any further issues please let us know.
Kind regards
Mike Richardson