Now, when I choose something from the TaskName dropdown, I need the text below it to show the content of MainTask>Description, but the text cannot even read the Lookup result?
When you are in a form, nothing is written to the table until you submit the form, so computed columns, including relations and looks won’t have any values until it’s submitted.
My suggestion is to create a custom collection in the form that is sourced from the main table and set up to only show the description. Remove any actions from the collection. Then set a filter on the collection to only show the row where the Screen Value from the choice component matches the task name in the collection.
