I had a similar problem with a domain-joined computer not being able to connect to the Cloud Pod file share, with Event ID 31013 being logged in the Microsoft-Windows-SMBClient/Security event log.
In our case it was because of Group Policy enforcing the SMB Client security option "Microsoft network client: Digitally sign communications (always)".
A temporary workaround is to open PowerShell as Administrator and run:
Set-SmbClientConfiguration -RequireSecuritySignature $false
This will only last until the next Group Policy refresh though, so it may be necessary to exclude your PCs which connect to the Cloud Pod from enforcing this policy. Obviously this is not a best practice, and hopefully the issue is addressed in a future firmware update.
https://learn.microsoft.com/en-US/troub ... onnectionshttps://learn.microsoft.com/en-us/windo ... ons-always