Switch between B2C and B2B – Consumer selector

The user (B2B) is logged in and on the checkout page. When I select B2C (Private) the address is filled automatically but when I switch to B2B (Business) I have to manually enter the email, postal code etc … Did I forget to select something in backend ? I would like the fields to be filled automatically when I select Business. How can I achieve this ?

Thank you for any help