@DaKulla, @sam_nazarko: I think, here is a bug/issue with the smb implementation in Kodi.
The error results typically if the system does not know how to login to the Windows 10 system “//KONTOR-FILESRV1/”.
For this it tries to locate the logon credentials in
/home/osmc/.kodi/userdata/passwords.xml
where something like
<passwords>
<path>
<from pathversion="1">smb://KONTOR-FILESRV1/</from>
<to pathversion="1">smb://USERNAME:PASSWORD@KONTOR-FILESRV1/</to>
</path>
...
</passwords>
should be included. USERNAME is the local username to use on the Windows 10 system, PASSWORD the related password. I think server names should be all in capital letters.
With SMBv1 at this point Kodi simply showed a menu where you have to enter this information in case it is missing … and with the current Kodi and SMBv3 THIS DOES NOT HAPPEN ANYMORE.
@DaKulla: Can you compare the passwords.xml file of the working Vero 4k and the updated one and perhaps paste it, here? Of course change the passwords after you have pasted it before hitting the “Reply” button. 