So I may just be upset but apparently you may not Join a group for Trials after the door is opened and still get a score, I Can understand Not after the first boss or even the first enemy's but just the door, That is ridiculous. They should make that more clear and not put a group score at the end of the trial like you actually got it, If I had known that was not going to count then of course I would have ran it again.
Thank you for contacting The Zenimax Online Support Team. My name is Thomas, and I would be happy to assist you today.
In order to place on the leaderboards, you will need to be present the entire time of the trial. For example, if you come in after someone had used the door, but were there for the first monster kill, it would not include you on the leaderboards. If you are eligible for the leaderboards, you will see a message on the center screen announcing that the timer was starting.
Just a heads up if anyone asks you to join SO for a leaderboard run and says we just started and dude left...... Tell them to restart it or you will not get the score.
[Rant done]