You need to be using the Apache web server application with PHP running as a module within Apache. You are not.
You are using the "nginx" web server application, where PHP cannot run as a module, only as a CGI (which is where the web server doesn't interact with PHP, it only passes calls to it and returns the responses) which does not work with the archive feature.
You may want to ask your hosting company about getting moved to Apache. They will explain additional costs, downtime, and the pro's and con's of each.
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