Hello,
Unfortunately, there is no supported way to directly reveal the email address associated with the BitLocker recovery key prompt. Windows does not display or expose the account information tied to the recovery key at startup for security reasons. The recovery key is bound either to the Microsoft account, Azure AD account, or Active Directory domain account that was used when BitLocker was enabled.
The correct approach is to determine how the laptop was provisioned. If it was joined to Azure AD or Microsoft Entra ID, the recovery key is stored in the tenant and can be retrieved by an administrator through the Microsoft 365 Admin Center or Entra portal under Devices > BitLocker keys. If it was domain‑joined to on‑premises Active Directory, the recovery key is stored in AD under the computer object’s attributes and can be retrieved with the Active Directory Users and Computers console or PowerShell. If it was set up with a personal Microsoft account, the recovery key is stored in that account’s portal at https://account.microsoft.com/devices.
Since the person who set up the laptop is no longer available, you will need to check whether the device is joined to your organization’s domain or tenant. If it is, any Global Administrator or Domain Administrator can retrieve the recovery key. If it was provisioned with a personal Microsoft account, only the owner of that account can access the key, and you would need to contact them directly.
There is no supported method to bypass BitLocker or to discover the associated email address from the recovery screen itself. The only way forward is to identify the management context (Azure AD, AD DS, or personal Microsoft account) and retrieve the key through the proper administrative channel.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
Domic Vo.