Hello,
Thank you for your question.
- Please check in the new File server the Group or Users permissions are identical applied.
- Please check share name of folders and Permissions are same as old server.
- Right Click on .lnk file and see what is target path of new file server.
- Please check if new file server resolve with both hostname and FQDN.
- I would also suggest please use GPO for drive mapping instead of .bat file
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