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[JannikT]

I am aware that there is a difference between concentrations and minors. So it is in theory possible to complete several minors and concentrations within a major, typically in business. And double majors are prohibited on YourPace.

If I sound confused, it is because I am some what confused. Partly contradictory information has been posted by people who have experience with UMPI. It is even more confusing that UMPI has one set of rules for brick & mortar students, and another one for Your Pace, and very limited information is provided on the YourPace homepage.

You're using the incorrect lingo. The majors are Business Administration, Accounting, Criminal Justice, History & Political Science, and English. The Concentrations are Accounting, Project Management, Marketing, Supply Chain Management, and Management & Leadership. The minors are Project Management, Management Information System, Management, Accounting, and Educational Studies. The degrees are BA - Bachelor of Arts or BLS - Bachelor of Liberal Studies. You can't just add concentrations and minors to any degree. 

Once you're an actual YourPace student, it all makes sense. The only thing that really applies to YourPace students on the on campus UMPI website is the GEC and even that is a bit modified for YourPace students. We do not have access to all of those courses.

I dont see how I am using the lingo incorrectly. Business degrees have a concentration, as you noted, while the accounting degree is another major. History & Political science is one major, with two different concentrations. 
According to ashkir it is possible to do more than one concentration within the business major. 
You claim that there are restrictions to which specific minors can be added to a particular major. This might be true, but it is not apparent from the YourPace home page what these restrictions are. 
I am no wiser as to which combinations are allowed. Can you for instance ad a minor to the accounting major?
UMPI should state these restrictions explicitly on the YourPace page, in order to clear up any potential misunderstandings. All of this might make sense to an enrolled person, but looking at it from the outside, it is not particularly transparent. 
As a potential student I want to know beforehand what my options are.