What is rate limiting?
Rate limiting bounds how many requests an identity may make in a period, answering 429 when the bound is crossed. Two different limiters exist here for two different beneficiaries: an edge limiter per tenant that protects the service, and an account cadence governor that protects the customer’s identity on the target site.
Why it matters
Conflating them leads to the wrong fix. A 429 from the edge means slow your calls down; a 429 from the cadence governor means this specific login is being paced, and spreading work across accounts — not retrying harder — is the answer.