Hello Shahani Silva,
Thanks for your question
It does not incure costs. However, For identity and access reports, such as sign-in logs, the rate limit is 5 requests per 10 seconds per application per tenant. Exceeding this limit will result in a 429.
This is documented here:
https://learn.microsoft.com/en-us/graph/throttling-limits#identity-and-access-reports-service-limits
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Regards,
Abiola