first docker (binhex/arch-plexpass) permission issues

Im strying to get my first docker img working. I noticed in the logs that it shows:

2020-03-05 10:57:32,169 INFO exited: plexmediaserver (terminated by SIGABRT; not expected)
2020-03-05 10:57:32,169 DEBG received SIGCHLD indicating a child quit
2020-03-05 10:57:35,173 INFO spawned: 'plexmediaserver' with pid 76
2020-03-05 10:57:35,182 DEBG 'plexmediaserver' stderr output:
mkdir: cannot create directory ‘/mnt/user’: Permission denied

2020-03-05 10:57:35,203 DEBG 'plexmediaserver' stderr output:
terminate called after throwing an instance of 'std::runtime_error'
what(): Codecs: Initialize: 'boost::filesystem::temp_directory_path: Not a directory: "/mnt/user/appdata/plex/transcode/"'

2020-03-05 10:57:35,255 DEBG 'plexmediaserver' stderr output:
****** PLEX MEDIA SERVER CRASHED, CRASH REPORT WRITTEN: /config/Plex Media Server/Crash Reports/1.18.8.2468-5d395aa9d/PLEX MEDIA SERVER/751a2361-ee5e-9748-2765ab4f-00314952.dmp

2020-03-05 10:57:35,266 DEBG 'plexmediaserver' stderr output:
Error in command line:the argument for option '--serverUuid' should follow immediately after the equal sign

Crash Uploader options (all are required):

2020-03-05 10:57:35,266 DEBG fd 8 closed, stopped monitoring <POutputDispatcher at 22492446595584 for <Subprocess at 22492446700736 with name plexmediaserver in state STARTING> (stdout)>
2020-03-05 10:57:35,266 DEBG 'plexmediaserver' stderr output:
--directory arg Directory to scan for crash reports
--serverUuid arg UUID of the server that crashed
--userId arg User that owns this product
--platform arg Platform string
--platformVersion arg Platform version string

--vendor arg Vendor string
--device arg Device string
--model arg Device model string
--sentryUrl arg Sentry URL to upload to
--sentryKey arg Sentry Key for the project
--version arg Version of the product


2020-03-05 10:57:35,266 INFO exited: plexmediaserver (terminated by SIGABRT; not expected)
2020-03-05 10:57:35,266 DEBG received SIGCHLD indicating a child quit
2020-03-05 10:57:35,266 INFO gave up: plexmediaserver entered FATAL state, too many start retries too quickly

and the only thing I have figured out is to chown nobody:users /mnt/user (the directory already exists)

is there something I am missing?