Bitlocker requires a code whenever you change hardware signature - a graphics card

Bitlocker forces you to re-enter our BitLocker encryption key when a drive has been moved to different hardware.  Upgrading a graphics card will change the signature.  This means a graphics card upgrade may prompt you for your BitLocker key on startup.

You will be prompted for your key.  Hopefully, you saved your BitLocker key to your Microsoft account to paper or some secure device.

Microsoft provides the corporate recovery link

The boot screen refers you to https://aka.ms/bitlocker.  This is the location redirects to htts://login.microsoftonline.com where Enterprise Accounts keep their BitLocker keys.  You will get a message something like 

AADSTS50020: User account <your account> from identity provider 'live.com' does not exist in tenant 'Microsoft' and cannot access the application ....(MSProtect Website [wsfed enabled]) in that tenant. The account needs to be added as an external user in the tenant first. Sing out and sign in again with a different Azure Active Directory user account.

You probably have a personal windows account.

You may need the personal account link instead

https://account.microsoft.com/devices/recoverykey Login with our normal personal live account. You should see the BitLocker recovery keys.

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