Remove-SPWebApplication : An object in the SharePoint administrative framework, “SPWebApplication Name=WEBAPP”, could not be deleted because other objects depend on it. Update all of these dependants to point to null or different objects and retry this operation. The dependant objects are as follows:
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An object of the type Microsoft.SharePoint.Administration.SPIisWebsiteUnprovisioningJobDefinition named “Unprovisioning (AppName)” already exists under the parent Microsoft.SharePoint.Administration.SPWebService named “”. Rename your object or delete the existing object.