Strange problem here! I can't delete a Workflow. The environment is SPO.
I deployed a Workflow to a site and then tried to Activate it (Site Actions > Manage Site Features). Tying to activate it didn't work (although it worked fine on my test site) and there was no error message, just a correlation ID.
I logged into SharePoint Designer 2013 and tried Deleting the WF, but it simply went through the motions of deleting it, but it does not get removed. I tried creating a WF and then deleting it in the same site and there were no problems with that. I notice the 'Modified By' is app@sharepoint. I've tried different switching to different admin accounts, but still no luck.
Lastly, I've tried using Powershell to try and budge the Workflows, but still no joy with this.
Does anyone know how I can remove these Workflows ?
Many Thanks,
Alan