Nothing from the old content works.

[Onyx2]

Hello
Please don't take this as a hate, but as a genuine question.
I've never really been a new stuff grinder, the one who must always clear the new part of a new raid as one of the first. I always enjoyed farming already existing stuff (old mounts, transmogs, achievements...) more and Im not the only one like this. So I am asking when are you planning to start fixing the old raids, item drops, glories and other achievements? I would GREATLY appreciate it, thank you.

[Lerona]

You can check the Pre-Legion PvE section and check for already repoted bugs and contribute if you find some yourself. Other than that, there is no exact time of when the old content is going to get fixed as Legion content is the priority. It is going to get fixed eventually, unill then, there is nohing else that can be done except to wait patiently.