fido-2.js

var accountInfo = {
  rpDisplayName: 'Contoso',        // Name of relying party
  userDisplayName: 'John Doe'      // Name of user account in relying partying
}; 
    
var cryptoParameters = [
  {
    type: 'FIDO_2_0',
    algorithm: 'RSASSA-PKCS1-v1_5'
  }      
];

window.msCredential.makeCredential(accountInfo, cryptoParameters)
  .then(function (cred) {
   // If promised succeeds, send credential information to the server
    sendToServer({
               credential: {type: 'ScopedCred', id: cred.id},
               algorithm: cred.algorithm,
               publicKey: JSON.parse(cred.publicKey),
               attestation: cred.attestation
           }
     );
  });

Shouldn't it be window.msCredentials not msCredential?