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IAMBinding is a configuration you do once and it will overwrite the role members, so every time you run a binding against a role with a different set of members you're overwriting your IAM configuration. I recommend you either pass the entire list of service accounts to each role in an IAMBinding, or totally change IAMBinding to IAMMember and pass one member at a time.

This is what Authoritative and Non-Authoritative mean in the documentation, I think

I had this issue yesterday, and changed everything to IAMMember