Sticky problem here. All I've seen with Powershell is 2010 code, but I'm on the 365/Online version of Sharepoint.
I need to delete two site columns. I've removed them from everything I could imagine. Emptied both Recycling bins.
Still, all I get is this error:
Site columns which are included in content types cannot be deleted. Remove >all references to this site column prior to deleting it.
Thoughts? I either need to know where it is still sitting, or another way to remove.