There is actually no way to give them a friendly heads up, and then do your own thing. The only way not to be bound is by not sending them any notification at all...
I couldn't find a public copy of that.
The best starting point I found for reporting vulnerabilities was: https://github.com/microsoft/MSRC-Security-Research/security...
You can email without agreeing to anything. But for a serious issue Microsoft would obviously try and track down who you are and what jurisdiction you are in.
> MICROSOFT BOUNTY TERMS & CONDITIONS
> Last updated: July 23, 2025
> The Microsoft Bug Bounty Programs Terms and Conditions ("Terms") cover your participation in the Microsoft Bug Bounty Program (the "Program"). These Terms are between you and Microsoft Corporation ("Microsoft," "us" or "we"). By submitting any vulnerabilities to Microsoft or otherwise participating in the Program in any manner, you accept these Terms.
Who knows if its enforceable.