Thanks. This error can be caused by different kinds of authentication failures, but if guest/guest doesn’t work it’s most likely due to the issue mentioned in the xda-developers link you posted earlier.
This is the same as what I had already asked about earlier:
This is not really a Roon issue. SMB allows for anonymous logins with guest/guest. Previously this worked when logging in from Windows and it still works from other operating systems.
Microsoft has decided that this is a bad thing and has turned this off by default over the years in more and more Windows versions, and it’s making it unnecessarily difficult to re-enable it. In my humble opinion this is a poor decision on Windows Home versions because it is generally perfectly safe on simple home networks. (Note that the only thing this changes is whether you are allowed to use guest/guest to log into an SMB share which is already configured to allow this. IMHO, if a share was configured in this way, it is silly on a home network not to allow clients to use it).
I’m not a Windows user at home and I am not sure if re-enabling it is really so difficult in recent Win 11 Home as the xda-developers article describes it. You definitely don’t need the Group Policy Editor because this only provides an alternate way of creating Windows registry entries, which you can create just as well with the Registry Editor.
As mentioned, this came up on the forum many times before, and in all cases I am aware of it could be made to work by adding the registry entry as described in the following article - refer to the „Use Registry Editor“ section: