I am developing an application for a company, they gave me the admin role so I can edit provisioning files. I am getting \"Valid signing identity not found for distribution file
I came across the same issue and for some bizarre reason the method clearwater82 suggested didn't work.
But I found out this documentation on apple developer site. Might be helpful for someone else. It's just two simple steps.
FIRST STEP : Exporting Your Code Signing Assets to Your File System
SECOND STEP : Importing Your Code Signing Assets from Your File System
Hope this helps someone!