<PackageReference Include="Microsoft.Identity.Client" Version="4.86.0" />

Microsoft.Identity.Client.IByUserFederatedIdentityCredential

public interface IByUserFederatedIdentityCredential
Provides an interface for acquiring tokens using the User Federated Identity Credential (UserFIC) flow.
AcquireTokenByUserFederatedIdentityCredentialParameterBuilder AcquireTokenByUserFederatedIdentityCredential(IEnumerable<string> scopes, string username, string assertion)

Acquires a token on behalf of a user using a federated identity credential assertion. This uses the user_fic grant type. The user is identified by UPN.

AcquireTokenByUserFederatedIdentityCredentialParameterBuilder AcquireTokenByUserFederatedIdentityCredential(IEnumerable<string> scopes, Guid userObjectId, string assertion)

Acquires a token on behalf of a user using a federated identity credential assertion. This uses the user_fic grant type. The user is identified by Object ID (OID).