Blocked from your own Microsoft Account

I've just migrated from a MacBook Air to a MacBook Pro. Everything went smoothly except Microsoft. It doesn't recognise me and now I have View Only access to my documents as I' using a Mac.

What do I need to do to ensure that I'm allowed to continue working on a Mac (as I have been doing for years).  I have a paid subscription and work as a freelancer with a business that uses Microsoft suite.

Thanks for any help. I'm sure it's a small setting somewhere that needs tweaking.