Contacts are stored in one app and address book is another app.
Microsoft has a small mess in this area and if you want to keep your information in Outlook Contacts then then it seems to be just fine as long as you are in Outlook.
Or you are asking about something else but here, W10's address book is something other than Outlook Contacts.
I just had Windows 10 home and Microsoft office Pro 2016 installed on my computer. When we imported the contacts from Outlook 2010 they show up in the contact folder but not in the address book. My brother-in-law who works on computers for a living I spent 2 days going through everything he could find on the Internet to solve the problem to no avail. I am hoping somebody on here might have a bright idea. One thing that I do find odd is that all the contacts that I imported from Outlook 2010 will not show up in the address book. But if I create a new contact that will show up in the address book. I am grasping at straws trying to get this problem fixed.
Thank you very much in advance for any advice you might have.