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Please can you try the following
The first step is to ensure that your Contacts folder is configured to be part of the Outlook Address Book. If it is, the next step is to reset the Outlook Address Book settings. Start with the first section below and, if necessary, continue with the second section.
Configure a Contacts folder as part of the Outlook Address Book
On the Go menu, click Folder List.
Keyboard shortcut To view the Folder List, press CTRL+6.
In the Navigation Pane, right-click the Contacts folder, and then click Properties.
On the Outlook Address Book tab, select the Show this folder as an e-mail Address Book check box.
If the check box is already selected or the option is dimmed or grayed out, proceed to the next section for additional steps.
Reset Outlook Address Book settings
On the Tools menu, click Account Settings.
Click the Address Books tab, and then do one of the following:
Please let me know if this resolves your issue
If under Name, Outlook Address Book appears, do the following:
Close the Account Settings dialog box.
On the Tools menu, click Address Book.
In the Address Book dialog box, on the Tools menu, click Options.
Under Show this address list first, click Contacts.
NOTE If you are using a Microsoft Exchange Server account and want names from your organization's online address book or Global Address List to appear when you click To, Cc, or Bcc, click Global Address List instead of Contacts.
Click OK, and then close the Address Book dialog box.
If under Name, Outlook Address Book does not appear, do the following:
On the Address Book tab, click New.
Click Additional Address Books, and then click Next.
Under Additional Address Book Types, click Outlook Address Book, and then click Next.
On the Account Settings dialog box, click Close.
Exit Outlook, wait one minute, and then restart Outlook.