Find Microsoft Edge blocks my post. I will modify post your first link referenced
"When setting up file shares two kinds of permission apply, Share Permissions and NTFS Permissions. It sounds like your NTFS permissions are well set with the AD group you created (FiberFin Users), so, I would take a look at the Share Permissions. Also take note that if the same account is referenced in security twice, the more restrictive one will win."
Relooking at Share find that the Share permissions were not set
I can not select the following as an answer:
Hi, Here’s a case similar to yours: https://social.technet.microsoft.com/Forums/en-US/3f07368e-8118-4f54-9e09-4b5278a6f5ef/quotyou-need-permission-to-perform-this-actionquot-server-2019 I noticed that that client finally solved the problem after the UAC settings. Would you give a try? If the problem remains, I suggest that you contact Microsoft Customer Support and Services where more in-depth investigation can be done. If the issue's proved as system flaw, the consulting fee would be refund. Global Customer Service phone numbers: https://support.microsoft.com/en-us/help/13948/global-customer-service-phone-numbers Hope this will help. Best regards, Danny