Currently I have a bundle ID such as:
com.mycompany.app and com.mycompany.app.debug.
1 of my Apps in App Store Connect is connected to com.mycompany.app where I want the other App to be attached to com.mycompany.app.debug. However, fastlane complains when trying to upload to testflight using the com.mycompany.app.debug.
Apple tools — including Xcode, the Apple Developer web site, and App Store Connect — treat each bundle ID separately. Two closely related bundle IDs, like the ones from your example, are still treated as separate apps [1]. I suspect that this is a problem with the third-party deployment process you’re using and, given that, I recommend that you escalate it via their support channel.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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[1] The only restriction is that if your app contains an app extension then the appex’s bundle ID must be an immediate ‘child’ of the containing app’s bundle ID.
I ended up resolving it by specifying correct schemes and provisioning profiles.
