As described here , Solid-OIDC uses Demonstrating Proof of Possession ( DPoP )

To make it work with FedCM, I had to pass the DPoP header through the optional FedCM nonce parameter of navigator.credential.get, but it would be nice to have a dedicated optional field.

Something like:

navigator.credentials.get({
  identity: {
    providers: [{
      nonce: "not-a-nonce",
      clientId: "yourClientID",
      registered: true,
      dpop: "dpopHeaderString",
    }]
  }
});