The BitLocker website where you can get your recovery keys is down and has been for almost 24 hours. There does not appear to be any official statement or status page from Microsoft. This means that if you have changed something in your BIOS and need the recovery key, your Windows installation is now unusable until the website comes back up.

Probably fortunate for Microsoft that it happened on a weekend, but they'll really be in trouble if the outage continues into the working week.