I tried this option as well: https://forums.plex.tv/t/linux-tips/276247/21#second-choice-after-a-hard-password-reset-on-plextv-3
But this returns:
[root@TUXSIL eljejer]# systemctl start plexmediaserver
[root@TUXSIL eljejer]# curl -X POST ‘http://127.0.0.1:32400/myplex/claim?token=claim-LpVu-1xysxxQfoeSb_3w’