I've seen posts that migrating Personal to Business Accounts is not possible.
Sadly I've created (before there was a distinction between two types, many years ago) I created all our Business resources under my business email account name but it's been set as a 'Personal Account'
I have a business email e.g info@companyname.com and a personal work, myname@companyname.com
My subscription and payment details are under info@companyname.com but set as a 'personal account'
To save me valuable time and prevent me from moving across to AWS (my team preference), I need you lot at Microsoft to figure out how to resolve this common problem.
Move my subscription and everything to be a Work / Business account... then I might consider moving us all to Office 365 also.