Hello MikeBerk,
First of all, if your computer is managed by an organization or company, you may need to consult with your IT department for unlocking it. Main reasons might be a hardware change, some sort of unauthorized access (for example entering the wrong password a certain amount of times).
If you are logged in with a Microsoft account (live, outlook, hotmail, o365 domains) the recovery key will not be on your email, but in your OneDrive, as a TXT file. Usually with name Bitlocker Recovery Key THE-KEY-DIGITS-ETC.txt
Another option, is to start the computer with CMD as Administrator and run the command: manage-bde -protectors X: -get
Hope this helps with your issue,
Best regards,