On the Ad accounts page, you'll find a list of your accounts and their associated status.
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Your ad account can be in 3 possible statuses: Active, Deactivated, or Closed. These statuses are mutually exclusive and are controlled by Roku.

Your account is fully set up and ready to run campaigns.
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You'll receive an email letting you know the reason Roku has stopped your ad accounts and any active campaigns. The most common cause for deactivation is a failed payment. Once you fix the issue, your account will be reactivated and your status will be changed to "Active".

Your ad account has been closed and won't be reactivated.