Xamarin iOS ClientAssertionCertificate reference error

[BradleyDHobbs]

Which platform has the issue?
Xamarin iOS

What authentication flow has the issue?
Mobile app when acquiring token for client side encryption.

Is this a new or existing app?
This is a new app or experiment

Repro
When I build the project while connected to a physical iOS device, i get the reference error. iOS simulator works fine.

        private async Task<string> GetTokenAsync(string authority, string resource, string scope)
        {
            if (!string.IsNullOrWhiteSpace(Token))
                return Token;

            var authContext = new AuthenticationContext(authority);
            ClientCredential clientCred = new ClientCredential(
                "clientid",
                "clientsecret");
            AuthenticationResult result = await authContext.AcquireTokenAsync(resource, clientCred);

            if (result == null)
                throw new InvalidOperationException("Failed to obtain the JWT token");

            return result.AccessToken;
        }

Expected behavior
The build should not throw any errors similar to the iOS simulator behavior.

Actual behavior
Build throws an error when debugging on physical device

Additional context/ Logs / Screenshots
error MT2002: Failed to resolve "Microsoft.IdentityModel.Clients.ActiveDirectory.ClientAssertionCertificate" reference from "Microsoft.IdentityModel.Clients.ActiveDirectory, Version=4.3.0.0, Culture=neutral,

[jmprieur]

@BradleyDHobbs : Client Credentials is not available on mobile platforms (for security reasons)
Also, if this is a new project, we recommend you use MSAL.NET.

[BradleyDHobbs]

Yes this is a new project. Trying to do client side encryption for sensitive document images taken from the camera.

So I would use MSAL.NET to acquire a security token to authenticate with Azure Key Vault?