unable tobuild chain to self-signed root for signer

Hello @mc !

Your iOS apps must be signed with a valid Apple certificate. If the certificate chain can’t be verified (e.g., self-signed or missing trust), the build fails. This happens if:

• The signing certificate isn’t trusted on your Mac.
  • The provisioning profile doesn’t match your device.
  • The device isn’t properly registered in Xcode.
  • Visual Studio can’t see the device because it’s not paired correctly.

Check Xcode Device Pairing

• Open Xcode → Window → Devices and Simulators.
• Make sure your iPhone is listed under “Devices” and shows as paired (not just connected).
• If it’s not paired, click Pair Device and follow the prompts.

Trust the Signing Certificate

• In Keychain Access on your Mac, locate your Apple Development certificate.
• Ensure it’s marked as trusted. If not, right-click → Get Info → expand Trust → set to Always Trust.

Provisioning Profile

• Log into your Apple Developer account.
• Confirm your iPhone’s UDID is registered.
• Regenerate or download a provisioning profile that includes your device.
• In Visual Studio, go to Project Properties → iOS Bundle Signing and select the correct profile.

Reset Remote Device List in Visual Studio

• In Visual Studio (Mac or Windows with Pair-to-Mac), refresh the device list:
  • Tools → iOS → Devices (or use the dropdown in the toolbar).
  • If your phone doesn’t appear, restart both Visual Studio and Xcode.

Check Wireless Deployment Settings

• If you’re trying to deploy wirelessly, ensure:
  • Both Mac and iPhone are on the same Wi-Fi.
  • In Xcode, enable Connect via Network for your device.
• Sometimes, first deployment must be done via USB before wireless works.

Clear Old Certificates/Profiles

• Old or expired certs can cause chain errors.
• In Keychain Access, remove duplicates or expired Apple Development/Distribution certs.
• Re-download fresh ones from Apple Developer portal.

I hope this helps! Let me know if you stuck anywhere!