Follow my article to Configure OneDrive for Business in CRM 2016 Online.
System Administrator can Grant/ Revoke access to OneDrive for Business feature in Online CRM, using “OneDrive for Business” Privilege.
Go to Microsoft Dynamics CRM -> Settings -> Security -> Security Roles
Open the required Security Role and Click on Core Records Tab -> Miscellaneous Privileges.
Click on OneDrive for Business to give access (Full Green) and Click on it again to revoke access (White) and Save.