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When running the command to promote the server 2019 to domain controller I get the following error:

PS C:\Users\Administrator> Install-ADDSDomainController -NoGlobalCatalog:$false -CreateDnsDelegation:$false -CriticalReplicationOnly:$false -DatabasePath "C:\Windows\NTDS" -DomainName $currentDomain -InstallDns:$true -LogPath "C:\Windows\NTDS" -NoRebootOnCompletion:$true -SysvolPath "C:\Windows\SYSVOL" -credential $cred -Force:$true -Confirm:$false -SafeModeAdministratorPassword (ConvertTo-SecureString 'h00dsEnd!' -AsPlainText -Force)
WARNING: Windows Server 2019 domain controllers have a default for the security setting named "Allow cryptography algorithms compatible with Windows NT 4.0" that prevents weaker cryptography algorithms when establishing security channel sessions.

For more information about this setting, see Knowledge Base article 942564
(http://go.microsoft.com/fwlink/?LinkId=104751).

Install-ADDSDomainController : Verification of prerequisites for Domain Controller promotion failed. The forest
functional level is not supported. To install a Windows Server 2019 domain or domain controller, the forest functional
level must be Windows Server 2008 or higher.
At line:1 char:1
+ Install-ADDSDomainController -NoGlobalCatalog:$false -CreateDnsDelega ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-ADDSDomainController], TestFailedException
    + FullyQualifiedErrorId : Test.VerifyDcPromoCore.DCPromo.General.99,Microsoft.DirectoryServices.Deployment.PowerSh
   ell.Commands.InstallADDSDomainControllerCommand

Message
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Verification of prerequisites for Domain Controller promotion failed. The forest functional level is not supported. ...
 

I have made sure the sbs2008 box is at the highest functional level.