That view shows the last 10 logins, and you can paginate through all logins for that user.

That should show all logins for a user, but you have to page through. You can also use the System > Login Records screen and search for the user and then see all login records.

That should give you the same results from the Manage User > Recent Logins.

Version 1.12 is quite an old version. I would recommend upgrading and see if you can recreate the issue.

At this point, you may also consider creating a KickStart script that loads the basic configuration with mentioned API keys, groups etc. into a fresh FA installation. You've mentioned that you are working on a test installation, so during the further tests you will probably fill it again with new test data entities. If so, it will most likely be easier to recreate the FA with basic configuration via KickStart, rather than to pick unnecessary entities and delete them one by one. Such script also stands as a good documentation on what configurations has been made to meet your environment requirements.

This post may be a bit off the topic, but from my experience such approach quickly pays off, so you can at once solve your issue and boost up your testing environment ergonomics.

How much memory are you giving to the java process?

You can also switch to the database search engine and see if removing ES resolves the issue. At that point it might be a resource issue.

https://fusionauth.io/docs/v1/tech/tutorials/switch-search-engines/ has instructions on how to change these.

I totally forgot to add the register the user manually to the FusionAuth application. It is working now, thank you!

This functionality isn't built in to FusionAuth.

This kind of identity assumption is usually pretty application specific, so I'd probably implement it at that layer (maybe by using something like https://github.com/ankane/pretender if you are working in rails).

Please feel free to file an issue explaining the use case for this functionality in an identity provider: https://github.com/FusionAuth/fusionauth-issues/issues