According to the article below, the MDCA (MCAS) integration with Sentinel includes the ability to forward discovery logs (from your firewalls that are already sending to MDCA) to Sentinel. You should not need to send them to Sentinel separately, if you use this integration.

https://docs.microsoft.com/en-us/defender-cloud-apps/siem-sentinel#integrating-with-microsoft-sentin...
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