Policy Key - assertion_signing_key

[tsmccartan]

In the documentation, it says to use the following as the Policy Key:
In Secret, enter your client secret that you previously recorded.

But this was never shown in the documentation previously. I believe this needs to be some Private Key? to work with Login.gov, as Login.gov requires a Public Key Cert in PEM Format.

Could you elaborate on the exact steps on the Certificate needed for Login.gov, and how to match that in a Policy Key in B2C? I am struggling with this and constantly get: AADB2C90289: We encountered an error connecting to the identity provider. Please try again later. Which I believe to be a Secret issue?