Problem whit username change

Hello dear Mojang.

When I log into my minecraft java account via microsoft on the minecraft webpage and to to account section to change my username it says: Editing your personal information or security must be done via your Microsoft account. and than there is a link (Log in at account.microsoft.com) that only redirects me to a page whit general info and settings of my microsoft account (https://account.microsoft.com) where it is not possible to change my minecraft username. What should I do?

Thank you for resolving the issue.