Lost access to test server

I have had Plex running in a docker container for several years. After setting up a test server to prepare to migrate from the old box, I logged in with the same username but slightly different email address. Now, that email address seems to be the only one that works, but I cannot access the new Plex server at all and I cannot change the email address back to the original. I’m wondering 1) how do I get the new server registered with my email, and 2) what is the correct way to setup a test server in order to switch over from the old box? I can login to Plex with just my username, but once I do I only see the old server. Previously I could see the new server also. Thanks

Don’t use different plex user accounts for different servers. It’s not necessary and only makes life complicated.

That is highly unlikely, or even impossible.
When you login, you are logging in to your user account on plex.tv.
You are not logging in to an individual server.
(Which creates the difficulties if you try and use different user accounts while using the same web brower/plex app.)

To set up a second server (to be used in parallel to the first server), use the same access credentials as for your first server.
DO NOT copy the Preferences.xml file from the first server. (you are free to copy all the other content of the plex data folder, if you want to replicate the curent server’s libraires. But do it only while both servers are stopped.)
DO NOT use the same external port number (in the “remote access” settings) as your first server uses. (if you want your second server to be available remotely as well, you need to create a second portforwarding with a different external port number)

I am not a Docker expert, but this is the basic route forward:
Ensure that your web browser is logged into your primary plex user account (the one which is used for your first/old server)
Use this script to claim your second Plex server into the same user account: GitHub - ChuckPa/UserCredentialReset: User Credential Reset utility for Plex
After this, both servers should be accessible in the web app if you switch the left side bar into the MORE… mode.
The settings of both servers are accessible if you enter the Settings section of the web app.
There is a drop-down selector in the left side bar, which lets you switch between the two servers.

After creating libraries on the new server, they should become available for sharing as well, when you click on your shared users’ names in https://app.plex.tv/desktop/#!/settings/plex-home as well as in https://app.plex.tv/desktop/#!/settings/manage-library-access
(it sometimes takes a stop/restart of the server, or a reload/refresh of the web app until you might see freshly created libraries in there)

Thank You for the detailed reply. I will make some changes and test today. Thanks again.

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