Follow the Xcode signing flow to provision your project:

    
      Open the default Xcode workspace in your project by
running open ios/Runner.xcworkspace in a terminal
window from your Flutter project directory.
      Select the device you intend to deploy to in the device
drop-down menu next to the run button.
      Select the Runner project in the left navigation panel.
      
        In the Runner target settings page,
make sure your Development Team is selected
under Signing & Capabilities > Team.

        When you select a team,
Xcode creates and downloads a Development Certificate,
registers your device with your account,
and creates and downloads a provisioning profile (if needed).