Hi Warren,
I think you you need to go to your system adminitrator in this case. It looks like either the machine was not setup correctly or the share that you are trying to reach is setup in correctly. With the information provided wa unfortanately cannot help more.
Is the machine EntraID Joined/Hybrid Joined or AD Joined? Where does the share point to is this a share on a fileserver on Azure Files? In case of Azure Files what kind of security is setup on the share?
Rex