Greetings this is the same problem that i am having.
have you come up with any solution at this point
i to have deleted everything and when I try to log back in from the web app it tells me that I need to download Plex media server but I am already it the server app.
At this point I am ready to delete my whole account and start a new one but I have a lifetime plex pass and I dont want to have to pay the money again once I start a new account
On the DSM 7 installation page (the first menu)
*. Install using Plex Claim Token
*. Get Plex Claim Token link
*. Browser opens
*. COPY the token into the browser
*. Return to install tab
*. PASTE the token into the window
*. Click NEXT then DONE
*. It begins installing
*. When complete, It will report: Claimed by: YourPlexUsername
*. Open the Synology by its LAN IP. (Do not use QuickConnect or FQDN)
*. Once opened by IP . you can then use it any way you want.
(I will address this in the next installer update for DSM 7 to be more forgiving)
At this revision of the packaging, you need both (unfortunately).
I’ve made a change to the “Plex Claim Token” code in the installer to remove the “First Login” requirement. It took a lot of experimenting but I finally made PMS happy