Hello
Please check whether there is a value for the UseOnlineContent registry
entry. This registry entry is used to allow or prevent a user from connecting to Office Internet resources. If the entry exists, the value must be set to 2 (Allows the user to access Office 2013 resources on the Internet).
1. Click Start, click Run.
2. Type regedit, and then press Enter.
3. Locate and then click the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Office\<xx>.0\Common\Internet\UseOnlineContent
Check the following article for more detail:
https://support.microsoft.com/en-us/help/3039000/-this-feature-has-been-disabled-by-your-administrator-error-in-office
Please remember to click Mark as Answer on the answer if it helps you