Unable to add an authorised device

OpenMediaVault 7.1.1-1
Docker compose

I have spent all evening going round in circles!! I have been using Plex media server in OMV docker for many years without problems. Recently after a server upgrade I am now trying to use Docker compose, it having replaced Portainer.

My server is up and running on my home network and accessible via safari. The problem is that I have no authorised devices. I deleted the existing server device as it wasn’t showing me any media at all.
The instructions on Plex are not helpful, Login, settings, authorised device, add a device.
There is no option to add a device. There is no information as to why this might be nor how to fix it.

How do I add my OMV server as an authorised device? Thank you

Update. Looking at Grant Library Access I get the following

Grant Library Access

Choose the libraries Richardwilkinson18@gmail.com can acces
You don’t have any connected servers.

Can you reach the Plex server settings?

In Settings → Server_Name → General, is the server claimed?

You should see “Server claimed by <your_email_address>.”

Claiming the server assigns it to your plex.tv account. Once claimed, it is added to your list of Authorized Devices, https://app.plex.tv/desktop/#!/settings/devices/pms.

You can also use the UserCredentialReset utility to assist with claiming.

Thank you for responding.
Settings - server name - General makes no mention of server. Actually I don’t see my email address either. My username is at the top of the left side column

I tried the UserCredentialsReset utility but no joy. It returns
root@xxxxxxx.xxxxx/Config/Plex/Library/Application Support/Plex Media Server# sh UserCredentialReset.sh

Unrecognized host type. Cannot continue.

Under the General tab I did find ResetCustomisation where it says
Reset sidebar navigation and home screen layout to the default state. You’ll be redirected to the Setup screen, where you can choose a server (if you have access to more than one) and other media providers from which to build your navigation and home screen content.

This looked promising as it mentions choosing a server. However, on clicking the screen goes blank and I get a spinning icon for 30 mins then I killed the web page.

Another Update
Been doing more searching. Found a suggestion to delete Preferences.xml.
Did that went back to ipaddress:32400/web and got to the add server page.
Now I can see my server, and my media is visible. More testing to do but looks as if problem is solved.

Thank you for helping

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