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Do not use a FQDN when attempting to setup the server. PMS will reject the attempt (treats it as if remote) without further consideration.
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accessing http://ip.addr.of.qnap:32400/web is all you normally need. The NAS must be connected to the internet gateway with viable DNS to find plex.tv
It will probably help to pull the logs files maually.
This is the “PlexData” shared folder (an artificial construction) which allows access to the QPKG internals via File Station.
Please create the shared folder (exactly as shown), Restart Plex then shut it down, grab the logs ZIP manually from FileStation and add here.