Ensure all dropdown and multiple choice questions have been completed within the vacancy and have items added for Applicants to choose from.
ATS vacancy checks to ensure the vacancy will show on indeed:
Job title has been entered into the job information field.
City and country fields have been populated.
The vacancy has been set to External or both.
The vacancy closing date is in the future or is blank.
The option Allow posting on portals is selected within the ATS settings.