NFS 4.1 mounts as read only

Hello,

I've exported a nfs 4.1 share over 2012r2 with local mapping. I'm trying to mount it but it mounts as read-only.

I've found the following behaviour: Using Resolve-NfsMappedIdentity to a recently mapped user using guid 0 result is OK: (xxx\administrator or the user that i map, i've tested with several). But if after mapping i try to mount the nfs share and rerun the resolve-nfsmappedidentity command i get the user like this: administrato (it's not a typo i get it without the xxx\ for the domain or local machine and also without the last letter of the user).

PS C:\> Resolve-NfsMappedIdentity 0
AccountName                                              Type                                     Id
-----------                                              ----                                     --
administrato                                             User                                      0

any clue? I suspect that it is a bug either on the powershell cmdlet or the nfs behaviour. If that is the case how should I report this bug to Microsoft?

Thanks for your help.