On launching an SA campaign, it immediately moves to the completed state and there are no certifications within the campaign
The reason we don't have any certifications is because there are no certifiers. A certifier for a service account campaign is someone who is marked as the 'Primary Certifier' or 'Secondary Certifier' for a service account.
Primary certifier needs to be mentioned in the following path.
Admin > Accounts > (click on any service account) > Owner
The other option is to have a default certifier. If any service account does not have a primary or a secondary certifier, it will go to the default certifier.