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When DNS is not up-to-date it may not be possible to map shares on computers by computer name. When this happens, use IP instead.
In other words, when it is not possible to map a share this way: NET USE <driveletter or *>: \ <computername >share, then do it this way instead: NET USE <driveletter or *>: \ <ip-address>share.
You can obtain the IP address from ping or simply asking the computer owner.