Hello,
I suggest you check if the share permissions and NTFS permissions of the account you set up for the shared folder are correct. It is recommended to give the account full control permissions. If the account permissions are correct, but you still cannot access the shared folder, check if there are any relevant error messages when mapping the shared file. If so, please provide relevant error screenshots here.
I hope the above information is helpful to you.
Best Regards
Zunhui