Changed password as requested, but now I’m unable to access my windows server.
I’ve uninstalled plex server, restarted and and reinstalled still nothing but the orange triangles.
I don’t get the option to claim server and via the trey, even when logged in I don’t see my folders on the left, only generic ones.
When going through browser, all folders are there, but with the orange triangles.
Simple instructions if you could please.
Thanks in advance
Ah, I might have fixed it…. Till the next time 
Any clues, lots are going to be in this position given the recent security breach. I got it working on my Roku client by resetting customisations but the mobile client cannot see the server.
Ah, ok looks like the VPN on my phone was stopping it seeing the server for some reason, although its been on there for long time before without issue.
@fazer69 @pabhudds Yet another oversight by the Plex team. They failed to mention that you need to go to your local Plex address in order to reclaim your server after you perform the password reset.
http://{base IP address - most likely a router address 192.168.1.XX]:32400/web/index.html#!/
Then go to “General”. You will see a button that lets you reclaim your server. See how simple that was to include in their instructions on resetting your password? They mentioned this to absolutely no one in their mass email. And while there is a small section in the article they linked at the VERY BOTTOM OF THE EMAIL, they fail to be this simplistic or explicit. What a joke. Hope this helps everyone.
This is how they chose to tell you the above info:
Troubleshooting Plex Media Server Claiming
Once you load up the local/bundled version of the web app, most people have no issues claiming their Plex Media Server. But if you do have trouble, the most common problem will be that no server entry appears in the sidebar when you open the Settings in the web app. Some things to try:
If your Plex Media Server runs on a machine different from what you normally use every day (e.g. the server runs on a NAS and you use a laptop for normal usage), you need to make sure that you’re connecting locally. Review the information from the previous section again.
The simplest thing may simply be to use the third-party “ClaimIt” tool. That’s a script that will prompt you for your Plex account username/email and password as well as the IP address of the Plex Media Server and then claim the server using that account.
That said, this is a third-party tool and you should always be careful of providing account login information to third-parties.
This did not work for me. I simply can’t share my library anymore outside my home network. This happened right after the password breach, it just stopped working.
What version of the server are you running?
Encountered the same issue after the password reset and recommended “Sign out connected devices after password change”.
I run Plex Media Server on my QNAP NAS, installed from the Plex provided package. I followed the instructions on the “Why am I locked out of Server Settings and how do I get in?” support page to shutdown the server, edit the Preferences.xml file as instructed and restart the server, same thing
I uninstalled the package from the QNAP web console, but neglected to take a backup of the “xxxx/Library/Plex Media Server” dir on the NAS first. I noticed it was still present but absent many of the files and directories that were there prior to uninstall.
I downloaded the package again, even though it was the same version as the one I used to upgrade Plex Media Server last month. I reinstalled the package, accessed the local Plex web interface, logged in via plex.tv and selected the local user and … still the same “Not authorised
You do not have access to this server.” page.
After another hour of messing about without success, had I resorted to uninstalling the package again, blowing away everything left in the “Plex Media Server” work dir on my NAS, reinstalled it and when accessing the local web console again, was prompted to login and then it redirected to a “:32400/web/setup/” URL with a blank, gray page. No message, nothing.
Just about ready to demand a refund of my PlexPass, when I found a 5yo reddit post that at least got me access to my Plex Media Server again, which is now rescanning my libraries after having to reconfigure the lot.
The TL;DR that worked for me:
curl -X POST 'http://127.0.0.1:32400/myplex/claim?token=CLAIM_CODE'