To perform a BitLocker recovery process.
Second step is to enter this Recovery Key ID (to identify your key):
You will get a second key, which needs to be entered on your laptop in order for it to checked/used.
As a last step before contacting Microsoft, please visit aka.ms/myrecoverykey and sign in with any emails you may have used on your laptop,
Any Microsoft account, Hotmail, Outlook, Live etc may have recorded your key.
In some instances, other non-Microsoft supplied email accounts, if linked, Gmail, Yahoo, etc, may also have a copy of the key listed via the aka.ms portal