Need Help with HW Transcoding on a QNAP TS-453Be

What QTS are you using on that? 4.3.6?
There’s a lot of good things in The QNAP FAQ, but your workflow could be
something like this. Hop on your desktop or laptop and make sure there are
no open windows or tabs to a Plex player.

Then use your default browser to go to Plex.tv and sign in. After that,
in the upper right corner of the website, the Sign In will change to
Launch. Go ahead and hit that to launch the web client in your default web
browser. Don’t use blockers or Noscript on Plex’s website.

Once the Plex player client is launched, answer any questions it gives you,
then give it a minute or two to stabilize, then in the upper right hand corner
click your Account and now Sign Out.

You should now be brought back to a sign in screen. Close that tab.
We’re done with plex.tv.

Now open up a web browser tab to your QNAP, and log in as admin.
Click your Main Menu and choose Plex Media Server. It will open up
a new browser tab and that’s how you get back into your QNAP PMS directly.

Did it work?