There are 2 different types of statuses related to your campaigns:
User Status represents a user's action on a campaign: activation, pause or stop, whereas Delivery Status tells you precisely what is currently going on with your campaign and if any issues need to be resolved.
Delivery Status Definitions:
Campaign is receiving impressions and running without issues
Pause or Stop
Definition + cases:
User has paused the campaign
Reactivate or Stop
Campaign has reached its 'End date' - to reactivate it you need to update the Campaign Schedule
Reactivate by updating the 'End date'
Campaign has been stopped but will run until it runs out of budget (optional)
Reactivate, Pause, or Stop completely
Campaign has been stopped
Campaign didn't receive any impression for the last 30 days, and it now started the archiving procedure
Campaign went through the archiving process and is now Archived
Our Customer Success Team has rejected your campaign