If the organisation is enrolled to Apple Business Manager you could distribute trough that. See more on: https://developer.apple.com/support/volume-purchase-and-custom-apps/
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I think because the versions don't match. The version you want to publish is 1.0.0 which is fine except the app versions you have are 1.0.1 and 1.0. Try changing the version number in Xcode or change the version number in App Store Connect.
Could you share some code of the file where this occurs?