@Adrian Halfdan Ulland Thanks for posting in our Q&A.
Based on my research, I find someone has discussed this issue. Please refer to the following link:
https://www.reddit.com/r/Intune/comments/y9gr60/disable_mandatory_windows_hello_for_business/
Note: Non-Microsoft link, just for the reference.
In conclusion, it is needed to disable a tenant level Windows Hello for Business under Devices > Enrollment > Windows Hello for Business in intune portal. And then configure GPO or CSP to enable WHFB manually.
Hope it is what you want.
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