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Hi there!
Just to confirm, are you seeing any error when you are trying to access the shared folders from one account to the other? Or do you mean that the shared folders are not showing across family members on your Microsoft Family subscription?
It could be a file sharing issue rather than a subscription. I suggest to try checking the following guide from the Microsoft support page on how to share it properly:
https://support.microsoft.com/es-es/onedrive/share-files-and-photos-with-family-or-outlook-groups
Try checking the issue on the https://onedrive.live.com website instead of the app. Have the organizer and other family members sign in to OneDrive on the web and look under Shared → Shared with you and see if files will be visible.