Server doesn't connect with account

Plex Media Server Remote Access
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1

Server Version#: 1.32.6.7557
Player Version#: 4.108.0

Hi, after a new installation of my NAS with docker I wanted to restart Plex, but somehow it tells me that my server is not connected. When I click the connect button under General settings, it doesn’t work. In my Chrome browser console under network I find that this POST ends up with status 500:

http://192.168.80.10:32400/myplex/claim?token=claim-xxxxxxxxxxxxxxxxxxxxx-Plex-Product=Plex%20Web&X-Plex-Version=4.108.0&X-Plex-Client-Identifier=wp4zd3xbadm4yjm1uyldscw9&X-Plex-Platform=Chrome&X-Plex-Platform-Version=118.0&X-Plex-Features=external-media%2Cindirect-media%2Chub-style-list&X-Plex-Model=bundled&X-Plex-Device=Windows&X-Plex-Device-Name=Chrome&X-Plex-Device-Screen-Resolution=1564x892%2C1564x1043&X-Plex-Language=de&X-Plex-Session-Id=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

In Plex Media Server Log I find:

Oct 26, 2023 01:37:18.872 [140245295438648] WARN - [HttpClient/HCl#79] HTTP error requesting POST plex.tv/api/claim/exchange?token=xxxxxxxxxxxxxxxxxxxxmm3uo1 (6, Couldn’t resolve host name) (Could not resolve host: plex.tv)
Oct 26, 2023 01:37:18.873 [140245272578872] DEBUG - [Req#425] MyPlex: Did token exchange for claim (returnCode: -6)
Oct 26, 2023 01:37:18.880 [140245272578872] DEBUG - [Req#425] MyPlex: Got a token poked, let’s act on it.
Oct 26, 2023 01:37:18.881 [140245272578872] DEBUG - [Req#425/HCl#7a] HTTP requesting GET plex.tv/api/v2/user/privacy?X-Plex-Token=
Oct 26, 2023 01:37:23.888 [140245295438648] WARN - [HttpClient/HCl#7a] HTTP error requesting GET plex.tv/api/v2/user/privacy?X-Plex-Token=xxxxxxxxxxxxxxxxxxxxe host name) (Could not resolve host: plex.tv)
Oct 26, 2023 01:37:23.888 [140245272578872] WARN - [Req#425] [Analytics] Couldn’t get analytics privacy settings. Trying again soon.
Oct 26, 2023 01:37:23.888 [140245272578872] DEBUG - [Req#425/HCl#7c] HTTP requesting GET plex.tv/api/v2/release_channels?X-Plex-Token=
Oct 26, 2023 01:37:28.895 [140245295438648] WARN - [HttpClient/HCl#7c] HTTP error requesting GET plex.tv/api/v2/release_channels?X-Plex-Token=xxxxxxxxxxxxxxxxxxxxe host name) (Could not resolve host: plex.tv)
Oct 26, 2023 01:37:28.895 [140245272578872] WARN - [Req#425] [AutoUpdateRequestHandler] Couldn’t get update channels. Trying again soon.
Oct 26, 2023 01:37:28.895 [140245272578872] DEBUG - [Req#425/HCl#7d] HTTP requesting GET plex.tv/api/v2/features?X-Plex-Token=
Oct 26, 2023 01:37:33.901 [140245295438648] WARN - [HttpClient/HCl#7d] HTTP error requesting GET plex.tv/api/v2/features?X-Plex-Token=xxxxxxxxxxxxxxxxxxxxe host name) (Could not resolve host: plex.tv)
Oct 26, 2023 01:37:33.902 [140245272578872] WARN - [Req#425] FeatureManager: Couldn’t get features. Trying again soon.
Oct 26, 2023 01:37:33.903 [140245311638328] DEBUG - Completed: [192.168.80.28:52029] 500 POST /myplex/claim?token=xxxxxxxxxxxxxxxxxxxxmm3uo1 (4 live) #425 GZIP 20037ms 522 bytes (pipelined: 1)

Which is weird because when I run a wget inside my container like this:

wget https://plex.tv/api/claim/exchange?token=xxx
–2023-10-26 01:41:05-- plex.tv/api/claim/exchange?token=xxx
Resolving plex.tv (plex.tv)… 54.229.47.178, 52.16.114.76
Connecting to plex.tv (plex.tv)|54.229.47.178|:443… connected.
HTTP request sent, awaiting response… 404 Not Found
2023-10-26 01:41:05 ERROR 404: Not Found.

It says connected which means plex.tv can be resolved.
Now I am lost and need some support.

UPDATE 29.10.2023
I used the official docker image and retried with a fresh installation successfully. This post can be closed.