Adding an already created task to a plan timeline

[Nicholas Vassos]

I had a task in a project timeline and it disappeared. Does anyone know how to add a task that has already been marked "done" back to a project timeline? 

When I go to the project board where the task was listed, it still shows as having dependencies that are still on the project timeline and the epic is correct, but not showing on the plan timeline. 

[Mohanraj Thangamuthu]

Hello, Good day. You are using Timeline within project board or Advanced roadmap plan ?

If this is project board "Timeline", you can check the following setting.

If this is advanced roadmap plan, you can check the exclusion list.