Open this in an incognito browser
or use http://[server ip address]:32400/web
As an example if your server ip address is 192.168.1.5 enter http://192.168.1.5:32400/web
If you’re still getting nothing I would try this
https://forums.plex.tv/t/you-need-to-reclaim-your-server-but-dont-dare-to-touch-the-windows-registry/809720
