The same role works fine for one service but fails for another.
There are no obvious policy errors, yet access behaves unpredictably.
I’m confused about why IAM doesn’t seem consistent across services.
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The same role works fine for one service but fails for another.
There are no obvious policy errors, yet access behaves unpredictably.
I’m confused about why IAM doesn’t seem consistent across services.
Cloud IAM systems look unified on the surface, but each service evaluates permissions differently behind the scenes. Some services require additional implicit permissions, while others enforce stricter resource-level checks.
Cross-service interactions are especially tricky. A role might have permission to read from one service but still fail when that service tries to invoke another on its behalf. These dependencies aren’t always obvious when writing policies.
Effective troubleshooting means reviewing service-specific permission requirements rather than assuming a single policy behaves the same everywhere.
Takeaway: IAM consistency requires understanding how each service enforces access, not just writing valid policies.