Do not store your Bitlocker encryption keys on Microsoft's servers if your threat model includes governments or law enforcement. As this article points out, this is the result of a design choice Microsoft made. It didn't have to be this way.

https://www.forbes.com/sites/thomasbrewster/2026/01/22/microsoft-gave-fbi-keys-to-unlock-bitlocker-encrypted-data/

Microsoft Gave FBI BitLocker Encryption Keys, Exposing Privacy Flaw

The tech giant said providing encryption keys was a standard response to a court order. But companies like Apple and Meta set up their systems so such a privacy violation isn’t possible.

Forbes
Because of limited space, I am using "governments or law enforcement" as shorthand for anyone who can show up at Microsoft with a valid court order for your data. This is not a 1-to-1 mapping. I understand the difference and I don't feel like arguing about it.
@evacide To paraphrase Hank: "Government and government-accessories"