If you see this
Needless to say I am the “organization” and did not set this policy, MS did it all by itself without even notifying me of the change.
Found this worked!
By default this is set to ‘Not Configured’ change to Enabled and you should be all set.
Since my windows system is updated to Windows 11 25H2 I cannot access my Roon Rock. I cannot map to the network drives. I get the error 0x80070043 although I have changed the settings for the guest fallback protection to enabled.
Please follow the steps provided in this article from Microsoft’s Tech Community. They seem to be the best at solving this Microsoft-created issue:
I followed the steps of Microsoft. It does not work.
Then please reboot your Windows 11 system and recheck what you have done - the steps appear to work for everyone else who has had this issue.
I rebooted my system several times.
Does anyone know if 25H2 has changed something that no longer allows the recommended fix to work?
I’m still on Windows 11 Home 24H2 (the fix worked for this version) and would hate to lose access again after updating to 25H2. 
Thanks. Good to know.
It dunno but it worked just yesterday in the other thread for someone with 25H2 Pro after I posted this link:
Thanks. I remember that thread, but missed the OP was using the latest update (25H2).
I haven’t had any further problems over numerous updates since I first posted including the latest - I have not had to do anything.
For Windows 11 Home I believe you have to actually edit the registry, the policy editor is not present in home edition. I like to remote into my machines and prefer the policy editor to messing around directly with the registry, hence all of my machines run Pro.
Not so - the article I linked to gives the Powershell commands for Home users in step 8.
Good to know 
