OneDrive for Business Shared Libraries List not Working

Thanks for this - enabling Delve was part of the problem for us. I also found the following steps may also be necessary:

• If the Shared Library is part of a Microsoft 365 Group or Team, any users who are Owners need to be Members too. Sometimes this doesn't happen, especially if the Team Owner was assigned through the Teams Admin Centre - and causes problems in various places, including the Planner app. You can check this by adding a second user as an Owner, make the first user a Member, then make the first user an Owner again, and remove the second user.
• If the Shared Library is part of a Microsoft 365 Group or Team, make sure you access the Files area at least once - it is not created immediately when the Group or Team is first made.
• Create a file or folder in the Shared Library so that it is seen as 'Recently active' by Delve - then WAIT a while and it should appear.
• (You can also 'pin' or 'follow' a Shared Library - access it through the SharePoint interface, then change the 'Not following' link in the top right hand corner to 'Following'. However this should not be necessary if the above steps work https://support.microsoft.com/en-us/office/find-your-sharepoint-and-teams-files-in-onedrive-for-work-or-school-9275de7b-0b0b-40ee-8fa2-b17d1b0727d0)

Enabling Delve and then following these steps got most of our Shared Libraries to appear in our testing - although it still seems quite buggy.