the script Sync-ModernMailPublicFolders.ps1 deletes the public folder online

Office365Buddy  - I am having this issue as well. 

I also assumed that the script would do as stated in Announcing Public Folder Migration Scripts with Modern Authentication Support - Microsoft Community Hub of "which is used to synchronize mail-enabled public folders from Exchange Server to Exchange Online.”

However, I did capture a Write error below.

It should NOT be looking in our online org, it should be looking in our on-prem AD org.

Not to mention, all of our on-prem Public Folders ARE PF Mailboxes. 

Write-ErrorMessage : |Microsoft.Exchange.Data.StoreObjects.ObjectNotFoundException|No active public folder mailboxes
were found for organization xxx.onmicrosoft.com. This happens when no public folder mailboxes are provisioned or
they are provisioned in 'HoldForMigration' mode. If you're not currently performing a migration, create a public
folder mailbox.
At C(removed path for privacy)\tmpEXO_oziz4bng.f0a.psm1:1106 char:13
+ Write-ErrorMessage $ErrorObject
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-PublicFolder], ObjectNotFoundException
+ FullyQualifiedErrorId : ......