by Ken Task.
Just downloaded the lastest LTIProvider plugin from downloads and unzipped.
In the un-zipped archive there is a 'README.mediawiki' file. It is ASCII text you could open it on Windows by changing the filename extension to .txt and open with NotePad.
Here's a clip from that file:
== How it works ==
=== User authentication ===
* Users are created automatically in their first access to the system.
* Users are created with a hashed username and also with an auth method that disable direct login to Moodle.
* Users are allways enrolled in the course where the activities are.
You can choose which role has the Learner and the Teacher from the remote system.
There is also settings for setting Users profile default values (email visible, etc...)
If you are going to have courses with local and remote users enrolled, I recommend you to create these new roles:
* External teacher
* External student
The 3.1.x built in docs is here:
https://docs.moodle.org/31/en/External_tool_settings
I've not tested/explored either to the max, but could be the addon plugin offers something different from the builtin.
'spirit of sharing', Ken