Set-MailboxJunkEmailConfiguration issue

Hi everyone.

While executing the following command I encouter the following error

[PS] C:\Windows\system32>Set-MailboxJunkEmailConfiguration -Identity "My valid identity" -Enabled $false
Junk e-mail validation error. Value: "An email address not in Trusted and not in blocked".
    + CategoryInfo          : NotSpecified: (0:Int32) [Set-MailboxJunkEmailConfiguration], JunkEmailValidationException
    + FullyQualifiedErrorId : E733D51D,Microsoft.Exchange.Management.StoreTasks.SetMailboxJunkEmailConfiguration

Any clue how to solve this issue.

Thanks in advance