There is a KB stating that Hello is known to not work with DDP: https://www.dell.com/support/article/us/en/19/sln302639/windows-hello-is-not-supported-with-dell-data-protection-security-tools?lang=en

And this is the real situation indeed (at least as soon as PBA has been configured; having DDP just installed does not break Hello PIN/Fingreprint).

Any idea when/if we can expect updated DDP?