If you want to access files in a shared folder/team/library/group from Outlook/Teams/Share Point in OneDrive, follow these steps:
- Login to the 365/Office website
- Open the full menu in the top left
- Select OneDrive
- If the share is visible in the Quick access section, select it
- If not, select More places... then select the share from the next page
- Select the new Add shortcut to My files option near the top
That action should be confirmed, and the shortcut visible in your OneDrive