title: Add Role to Existing User in Azure AD B2C using Graph SDK
body: <p>We are using GRAPH SDK to manage users In Azure AD B2C.
  We have been able to create an user account and now want to assign a role to the user.
  We have referred the documentation but not able to find the way forward.
  Is there a way we can assign role to a user using Graph SDK</p>
  <p>Any help on this would be appreciated</p>