New year, new deploy process! Late last year our mobile team completed the update to Swift 3 (and thus, the update to Xcode 8). The latest version of Apple's IDE includes a lovely feature: automating provisioning profile management! (Note: not sarcasm, the feature is really nice. Check out the WWDC video for an in-depth exploration.)
However, when I went to make our first automated deploy today, things didn't work; I got a somewhat cryptic error about code signing.