A Business Tax Dashboard will only show the tax position for the business taxes registered to your Government Gateway online account under the same User ID for up to 3 business taxes:
Corporation Tax or Self Assessment and
PAYE for Employers
If you have different User IDs for each HM Revenue and Customs online service, you can still view the tax position for each one separately from the 'At a glance' page within the relevant online service.
To get the full benefit of a dashboard you can bring your Corporation Tax or Self Assessment and PAYE and/or VAT taxes together under the same User ID.
See FAQ: I currently have separate Government Gateway online accounts (User IDs ) for my business taxes. Can I move my taxes under one User ID so they all show on my Business Tax Dashboard?