Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
When you try to change Authentication Provider for a Web Application, you could receive this error:
An object of the type Microsoft.SharePoint.Administration.SPWebApplicationProvisioningJobDefinition named "Provisioning 8b10f967-bf6e-482c-9bde-01edec2ac953" already exists under the parent Microsoft.SharePoint.Administration.SPWebService named "". Rename your object or delete the existing object.
Probably your old action is still pending for SharePoint.
Go to Central Admin -> Operation -> Timer Job Definition -> Delete the Provision Web App