Upon deeper research into the Constitution and Articles of Confederation, I found there are 3 Offices of President. The actual "Office of President" is for the actual sitting President. But if you take a closer look into these documents, it seems only a President who takes oath under article VI can fill that office, not the oath under article II.
The other two offices are, "Office of the President of the United States" and "Office of the President of the United States of America." It's clear enough to see these are different offices, but if I understand it correctly, the other two are reserved for appointment, and only by someone sitting in the actual "Office of President," under article VI, not II.
I find it extremely important to know, because if that's the case, then no one has ever filled the actual "Office of President" ever.
The only reason I could see for that is if a President wanted to have the power of taxation, which only congress assembled has, and not a President in the actual office.
And if that's true, than all Presidents have been mere employees of congress.
There are definitely 3 offices, so then whom would the other two be reserved for? The vice President and someone else perhaps? Maybe two trusted cabinet members? The President elect before reaching the actual office?
Seeing how most Americans don't even know there's a difference between the "United States" and "United States of America, this isn't going to be something anyone can answer. If I'm right, and I suspect I am, then not even Constitutional experts understand it. So if someone with real actual knowledge could help answer or verify this, it would be greatly appreciated. Thank you.