Content Type Hub - Cannot delete content type

Hi,

Guess this has been discussed many time and I have tried all different things without success. Have also an open ticket with Microsoft whom are just sending references to public docs which is not helpful.

My issue:

Cannot delete a Content Type (CT) from the Content Type Hub via the SPO Admin Center with the error that it is still in use.

What I have done:

1. I have tried to publish the CT, wait for +8h and then unpublish it and wait another 4-8h before trying to delete it.
   
   
2. Have emptied the primary and secondary recycle bin for each site in the tenant using PnP

Clear-PnPRecycleBinItem -All -Force​

3. Via code trying to find the content type and having it removed. Below code is currently saying that the CT with a specific ID is not found on any site.

function FindContentTypeById {
    param (
        [Parameter(Mandatory=$true)]
        [string]$ContentTypeId        
    )
    ## Get all sites in the tenant
    $siteCollections = GetSites
    
    foreach ($site in $siteCollections) 
    {
        $siteUrl = $($site.Url)
        Write-Host "+ Site: $siteUrl"
        ConnectPnPOnline -Url $siteUrl

        $lists = Get-PnPList
        foreach ($list in $lists) 
        {
            $ct = Get-PnPContentType -List $($list.Title) -Identity $ContentTypeId -ErrorAction SilentlyContinue
            if($null -ne $ct) {
                Write-Host -ForegroundColor Yellow "    - Found CT"
                Write-Host -ForegroundColor Yellow "      - Found: $($ct.Name) in List: $($list.Title)"
            }
        }

        $siteCTs = Get-PnPContentType

        $x = $siteCTs | Where-Object {(($_.Id).StringValue -eq ($findCT))}
        if($null -ne $x)
        {
            Write-Host "  - Found: $($x.Name) in ($site.Url)"
        }

        Disconnect-PnPOnline
    }
}​

I have also run code that looks for a Content Type by Name with the same result (not found).

So, any ideas what else I could do/try to have the CT deleted?

The CT Hub is in need of major improvements to better support SPO. Implementation of better logging/auditing capability (tracking down what site/list/item is restricting deletion) and better provisioning functionality are some. As of now the CT Hub is a loose canon causing lot of headaches and instead of using it I'm avoiding it.

/Adam