So I just saw that this plugin does not work with IIS which is what is underneath Azure. Is that the problem?
I am not using CDN. I removed all the extra domains from my Azure set up, deleted the cache and recreated. So far so good. Is it possible that the site was first browsed using the alternate URL, so the caching plugin generated the cached files using that URL?
We have a few custom domains that all resolve to the Azure web app. For instance:
https://correct-site.com/
and
http://extra-url.com/
For some reason, the cached versions of the pages are using http://extra-url.com/link for all the links instead of https://correct-site.com/link. What controls that?