Hello,
What type of Microsoft 365 do you have? If you are just a general consumer on Microsoft 365 personal/family/premium plan, it doesn't come with Windows Pro license at all. The plan is for office apps like Word, Excel, etc.
Unless, you have Microsoft 365 enterprise level license assigned to you by your work, then you could possibly upgrade from Home to Pro, but I need to know the exact name of the Microsoft 365 license you have.
Please be specific.