@RaGaDK
From your logs, the server is running.
Here you can see some of the media which is being scanned meaning it was setup at some point.
Oct 16, 2022 02:47:14.138 [0x7f7fcc8cbb00] INFO - Plex Media Server v1.29.0.6244-819d3678c - Ubuntu PC x86_64 - build: linux-x86_64 debian - GMT 02:00
Oct 16, 2022 02:47:14.138 [0x7f7fcc8cbb00] INFO - Linux version: 22.04.1 LTS (Jammy Jellyfish), language: en-US
Oct 16, 2022 02:47:14.138 [0x7f7fcc8cbb00] INFO - Processor: 4-core Intel(R) Xeon(R) CPU E3-1220L V2 @ 2.30GHz
Oct 16, 2022 02:47:14.139 [0x7f7fcc8cbb00] INFO - Compiler is - Clang 11.0.1 (https://plex.tv 9b997da8e5b47bdb4a9425b3a3b290be393b4b1f)
Oct 16, 2022 02:47:14.139 [0x7f7fcc8cbb00] INFO - /usr/lib/plexmediaserver/Plex Media Server
Oct 16, 2022 02:47:14.138 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Metallica', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.138 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/1996/Metallica/Load (parent: yes)
Oct 16, 2022 02:47:14.139 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Metallica/Load', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.139 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/1996/Metallica/Load/Play all (parent: yes)
Oct 16, 2022 02:47:14.140 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Metallica/Load/Play all', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.140 [0x7f7fc52c5b00] DEBUG - Activity: updated activity 123439d4-f656-41b8-b464-5b875ffc4195 - completed 81.8% - Scanning Musik
Oct 16, 2022 02:47:14.140 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/1996/Humleridderne (parent: yes)
Oct 16, 2022 02:47:14.141 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Humleridderne', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.141 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/1996/Humleridderne/Jeg gi'r en omgang hvis du gi'r to!! (parent: yes)
Oct 16, 2022 02:47:14.142 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Humleridderne/Jeg gi'r en omgang hvis du gi'r to!!', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.142 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/1996/Humleridderne/Jeg gi'r en omgang hvis du gi'r to!!/Play all (parent: yes)
Oct 16, 2022 02:47:14.143 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/1996/Humleridderne/Jeg gi'r en omgang hvis du gi'r to!!/Play all', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.143 [0x7f7fc52c5b00] DEBUG - Activity: updated activity 123439d4-f656-41b8-b464-5b875ffc4195 - completed 81.8% - Scanning Musik
Oct 16, 2022 02:47:14.143 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/2001 (parent: yes)
Oct 16, 2022 02:47:14.144 [0x7f7fc52c5b00] DEBUG - Skipping over directory 'Music_test/Years/2001', as nothing has changed; removing 0 media items from map.
Oct 16, 2022 02:47:14.144 [0x7f7fc52c5b00] DEBUG - Scanner: Processing directory /mnt/md0/Amazon Drive Downloads/Music/Music_test/Years/2001/Slayer (parent: yes)
Looking at Plex.tv, the only recent server I see is a Proliant.
That server was last seen by Plex.tv (signed in) almost 2 months ago.
LAN IP 172.16.0.15
Ubuntu 20.04.5 LTS
This suggests the server was signed out of your account some time ago.
Given the machine is on a different subnet, you’ll need to SSH tunnel to it and reclaim through the loopback adapter. (127.0.0.1:32400)