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You see this: xcodebuild prints error: Signing for "WebDriverAgentRunner" requires a development team. Select a development team in the Signing & Capabilities editor. Mobster shows Choose your Apple Account.

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Why it happens

The helper runs on your iPhone, and iOS only runs apps signed by a team. No team was chosen, or Xcode has no signing certificate for it.

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Fix

  1. Sign in to Xcode with your Apple ID: Xcode › Settings › Accounts.
  2. In Mobster for Mac’s setup, choose your Apple Account (your team).
  3. If Xcode has no certificate yet, in Accounts choose Manage Certificates › Apple Development.
  4. Build again.

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Check it worked

The build finishes and mobster doctor prints no ✗ line for the runner. Checked 26 Oct 2026 against Mobster 0.4.0. Back to Troubleshooting.