Remove Public Folder with heading \ as name

A Public Folder was accedently created as \bad folder\name and now can't do anything with it.

Get-PublicFolder -GetChildren|?{$_.Name -Like '\*'}

PowerShell line above works to find it, but trying to delete with Remove-PublicFolder or rename with Set-PublicFolder to get rid of the bad folder result in error about incorrect format of PublicFolderIdParameter. I've tried to use Exchange Online tenant as OrganizationName without effect.
If trying to use Outlook as client to do anything with it gives the behavior as not being owner of folder (grayed out delete/rename option, missing tabs in properties).

Get-PublicFolder -GetChildren | Remove-PublicFolder
Get-PublicFolder -GetChildren|?{$_.name -like '\*'} | % {Set-PublicFolder $_.identity -Name 'crap'}

Cannot process argument transformation on parameter 'Identity'. Cannot convert value "?\bad folder\name" to type "Microsoft.Exchange.Configuration.Tasks.PublicFolderIdParameter". Error: "The value provided for parameter "?\bad folder\name" isn't in the correct format. The correct format is "<OrganizationName>\\<Fold
erPath>"."
    + CategoryInfo          : InvalidData: (:) [Set-PublicFolder], ParameterBindin...mationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Set-PublicFolder
    + PSComputerName        : outlook.office365.com
LVL 31
Henrik JohanssonSystems engineerAsked:
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Simon Butler (Sembee)ConsultantCommented:
You will need to get Office365 support to remove the folder for you.

Simon.
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Henrik JohanssonSystems engineerAuthor Commented:
As suggested, I created a support ticket through the Office365 admin portal. When troubleshooting together with the support technician, I managed to get rid of the folder.

Solution:
 In the Office365 portal, go to admin -> Exchange -> public folders.
 Clicking on the corrupt folder in the Office365 admin portal gave the same error message about Identity is incorrect as when using PowerShell. Trying to go up to parent folder by using up arrow button gave some other error message. After repeating the up arrow clicking a couple of times and confirming the error messages, I got back to root folder where the folder was marked.
 By using the recyclebin button to delete the marked folder, it was finally removed.
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Henrik JohanssonSystems engineerAuthor Commented:
Problem solved when troubleshooting with Office 365 support.
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