Hello @James Early ,
Thank you so much for posting here.
Based on my research, the user should be administrator to manage the shared folder MMC snap in. If the user is not an admin, they need to be in the Data Administrators role to successfully connect.
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Best regards,
Hannah Xiong
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.