@CatherineM27 - You should be able to maintain your Free Plan team and add paid plans to your existing Miro account profile (by email).

I am trying to move from a free account to a company paid business account

If by “move” you mean you are trying to create/purchase a paid account, and if you are trying to create a Team, Business, or Consultant Plan, then you can use the Add teams button from your Miro dashboard:

More on plan types here:

https://help.miro.com/hc/en-us/articles/360017730233-Plans-and-Features-Available