I sometimes hate #Xcode and #iTunesConnect. I can't directly install a new build on my iPad since it's running iOS 11.1 and the Xcode version I have only supports 11.0.

(Updating will have to wait until sometime next week when I have wifi, since I'm not downloading a 5GB file via my cellular connection.)

Installing via TestFlight was giving me an error about my account not having "team access". Solution? Clean the build files, remove the account, restart Xcode, sign in, build again.