Hey there, which character is your main, the one you completed the campaign on first? Your main should have a quest called 'Destined Heroes' with two subquests, 'Lost in the Light' and 'Found in the Dark'. You should complete this quest on the main first. You will play the following missions - Queens I, Hollow I, Hollow II, Home I, Home II, Queens II. All of them will then be available on your alts. Trying to progress them on alts before the main completes Destined Heroes can cause issues with the rewards alts are supposed to receive.