How to give OneDrive access to another user

• Firstly, sign in to Office 365.
• Click the  app launcher and open “OneDrive.“
• Once OneDrive is open, click on the  Settings icon.
• Click on “OneDrive settings.“
• Click on  “More Settings“ on the left menu.
• Click on “Return to the old Site settings page.”
• Under “Users and Permissions,” click on “Site permissions.”
• Click “Grant Permissions.”
• Enter the name or email of the user who will get access. 
• Click on “Show Options” and select the correct level of permissions.
• Finally, click on the “Share” button.

How to give OneDrive access to another user (administrator):

• First, go to your Admin center.
• Click on the  menu icon and select “Show all” to reveal more options.
• Then select “Sharepoint” from the list of admin centers.
• In the SharePoint Admin Center, click ⋮ “More Features” in the left menu.
• Then, click the “Open” button under the “User profiles” header.
• Click the “Manage User Profiles” link in the “People” section.
• Enter the account name in the “Find profiles” box and click the “Find” button.
• Left or right click on the account name when it appears in the list.
• Then select “Manage site collection owners” from the popup menu.
• Enter the name of whoever you’re giving access to and click “OK.”
• Head back to your Admin center.
• Click the  menu icon in the Admin center’s top left corner.
• Click on “Users” to reveal more options.
• Select “Active Users” from the revealed options.
• Next, click on the name of the original OneDrive account owner.
• Click the “OneDrive” tab.
• Then click “Create link to files.”