When trying to delete a content type I am getting an error message stating it's still in use. Unfortunately Microsoft is extremely limited on documentation for this type of issue and the error message logging is limited and not useful. I am certain there is no place where it's in use. I have tried several methods posted here which includes running powershell scripts to find out where the content type is being used but those methods were ineffective. I spent an entire day trying to find out where it is to no avail and I'm at my wits end.
Below is a link to one of the solutions that suggests the powershell script approach. It didn't work for me.
If anyone can suggest another approach, I would appreciate it.