Hi there,
There is a known bug with key trust authentication on Server 2019 so be sure you have KB44887044 installed in order to fix that issue.
Microsoft has a pretty good page documenting known issues with deploying Hello for Business, so definitely check that page first to see if your issue is listed there.
Windows Hello for Business Known Deployment Issues https://learn.microsoft.com/en-us/windows/security/identity-protection/hello-for-business/hello-deployment-issues
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