Hi ,
Based on my understanding, the shared folder is in domain joined computer A. You want add a permission for a local user in a Workgroup Server B. Is that right? Please feel free to let me know if I have any misunderstanding.
You cannot add the permission for another Workgroup users. But you can create a local account on A&B with the exact same username and password. And then give this account permission to access the share.
Best Regards,
Candy
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