Junk email folder somehow moved under Notes folder, no way to move

One of our users called that her Junk email folder was disappeared in the Outlook client, but still visible in OWA. After some searching I retrieved the folder under the Notes folder:

Identity: <username>@<domain>.nl\Notities\Ongewenste e-mail

Name: Ongewenste e-mail

(Dutch, translated: Notes\Unwanted e-mail)

Whatever I try, there is no option to move the Junk email folder.

What have I tried:

• Made myself Owner: No way to move or delete.
• Created new Outlook profile without caching: No option to move or delete the folder
• Opened Outlook with "Outlook /resetfolders".
• Ran MFCMapi.exe and removed the folder: Re-appears under Notes.
• Disabled and re-Enabled JunkEmailconfiguration with PowerShell:
  Set-MailboxJunkEmailConfiguration -Identity $User -Enabled $false
  Set-MailboxJunkEmailConfiguration -Identity $User -Enabled $true.

Now I ran out of options, hopefully someone here has the solution?