A Microsoft file hosting and synchronization service.
Dear Daryl Liew,
Good day! Thank you for posting to Microsoft Community. We are happy to help you
Based on your description, we understand that you can't see subfolders in a shared folder. At the same time, I also noticed that other users don't seem to be experiencing the same situation.
First, I would like to see if the owner of the file can see if your account exists in the access permissions of these two folders.
Manage access to a file or folder
When you select an item in the Shared with list, the Manage Access panel opens:
- The Links Giving Access section shows the links that have permissions to the file or folder. Click the ellipsis (...) to see the users that the link has been shared with.

- The Direct Access section shows people and groups who have direct access to the file or folder. (This includes groups that have access to the site where the file or folder resides.)

When viewing who has access to a file or folder, internal users will have their name and job title displayed. External users will only have their email address displayed, with External User below the address.
If he doesn't see your name, I suggest he reshare both folders with you to see if they can access them.
Sincerely,
Tin | Microsoft Community Moderator