persistent code signing issues

[thrifting2025]

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• I confirm I have searched the Docs, Codemagic Sample Projects, and GitHub Discussions.
• I confirm the software versions on my local computer match the ones in CI environment (e.g. Xcode version, Gradle version). See here
• I confirm I am able to do a fresh clone of the repository and build the project on my local computer.

Which mobile framework are you using?

Flutter (Dart)

Steps to reproduce

running the build constantly triggers code signing errors

Expected results

I need the build to complete and move to app store connect for testflight

Actual results

I am experiencing persistent iOS code signing issues with my project, despite following all best practices and the official Codemagic iOS code signing documentation.
Summary of the issue:
My builds always fail at the code signing step with:
Did not find matching provisioning profiles for code signing!
Generated options for exporting the project - Method: ad-hoc
No profiles for ... were found: Xcode couldn't find any iOS App Development provisioning profiles matching ...
Signing Certificate: is blank
The build is in release mode (not debug).
The error persists whether I use automatic or manual code signing.
What I have done so far:
Provisioning profiles:
Only three App Store provisioning profiles exist in my Apple Developer portal (one for the main app, one for the OneSignal extension, one for the Firebase extension).
All are of type App Store, active, and linked to the correct iOS Distribution certificate.
Certificate:
Only one iOS Distribution certificate is active in my Apple Developer account.
My .p12 was exported from this certificate and uploaded to Codemagic.
The correct CERTIFICATE_PASSWORD is set as an environment variable.
codemagic.yaml:
The code_signing section references the correct file names and bundle identifiers.
The team_id matches my Apple Developer Team ID.
The build scripts use --release (not --debug or --no-codesign).
Codemagic UI:
Mode is set to Release.
Manual code signing is selected, and only the correct .p12 and .mobileprovision files are uploaded.
Other:
All extra/old provisioning profiles and certificates have been removed from the Apple Developer portal.
I have tried clean builds and re-uploading all files.
Despite all this, the build always fails to match the provisioning profiles and certificate, and defaults to ad-hoc/manual.
Could you please check if there is a backend issue, a bug, or a hidden mismatch that is not visible in the UI?
If you need any additional logs or screenshots, I am happy to provide them.
Please note i am on Windows using VSCode, codemagic and github. I am not using mac or xcode.
Thank you for your help!

Build id (optional)

6818fef06737086f1dd13088

[dam-ease]

Hello @thrifting2025,
Please, there are some things I'd like you to double-check and confirm on your end.

1. In App Store Connect, please check that your profiles were created for the bundle ID in your project, i.e. com.***.app2 and the others com.***.app2. FirebaseNotificationServiceExtension and com.***.app2.OneSignalNotificationServiceExtension
2. Double-check in your App Store development portal that the provisioning profile doesn't have an invalid expiration.
   
3. Search in your project to see if your bundle ID matches the com.***.app2 everywhere necessary, including the PRODUCT_BUNDLE_IDENTIFIER in ios/Runner.xcodeproj.
4. Lastly, that any of .xcworkspace or .xcodeproj isn't in your .gitignore or not present in your repository.