Is this where you looked? https://account.microsoft.com/devices/recoverykey
If your account is still locked, go here: https://support.microsoft.com/en-us/accounts-billing/manage/microsoft-account-has-been-locked Click on the Sign in button to go through the unlock process.
The bitlocker page can sometimes have issue like you described, and it is typically temporary server side related, but let's get your account unlocked first, so you can try again in case the link wasn't correct.