Note to Reader: This article assumes you already have Microsoft OneDrive installed on your computer, that it is running, and that you are logged into it with your work Office365/Microsoft365 account.
ISSUE: Your organization has created company-owned shared drives for collaboration, and granted you access to one or several of them. You've received an alert email from Microsoft saying you have access to a particular shared drive, but you don't see it in your OneDrive application on your computer. What follows are the steps to make that happen; you are best served following these steps on a computer rather than a mobile device.
Step 1: Open a web browser and log in to your Microsoft Office 365 account at login.microsoftonline.com.
Step 2: Click on the Application Selector menu in the top left and choose "SharePoint". If you don't see it listed, choose "Explore all of your Apps".
Step 3: In Sharepoint (on the web) under the "Following" section on the left, choose "See All", or click once on the team folder you wish to sync to your computer from the "Frequent Sites" list.
Step 4: In the chosen team drive, click on the three horizontal dots at the center-right of the screen (see them highlighted in a red box in the screenshot below).
Step 5: In the four-option menu that emerges, choose "Sync".
Step 6: You'll receive the following notice: "We're syncing your files". Click "Close".
Step 7: Wait 2-3 minutes, then return to your Windows Explorer and check the left sidebar. Half-way down you should see your company name and the folders that you've chosen to sync below it.
Step 8: That's it! Files you add into shared locations will be visible to anyone else in the organization that has access rights to the same locations.