Use Entity Framework 6 Migrations with SqlConnection with AccessToken - entity-framework

Question

I am trying to use EntityFramework 6 Migrations in conjunction with Azure Databases. I am using a SqlConnection with AccessToken to Connect to the Azure Database and Migrate.
public class MasterDbContext : DbContext
{
//...
public MasterDbContext(SqlConnection connection)
: base(connection,true)
{
Database.SetInitializer(new MigrateDatabaseToLatestVersion<MasterDbContext, Migrations.Configuration>(true));
}
//...
}
public async Task SeedMasterDatabaseAsync(string connectionString)
{
SqlConnection conn = new SqlConnection(connectionString)
{
AccessToken = "xyc"
};
using (var dbcontext = new MasterDbContext(conn))
{
dbcontext.Database.Initialize(false);
}
}
I am receiving the followoing exception:
Unhandled Exception: System.InvalidOperationException: This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection. ---> System.Data.SqlClient.SqlException: Login failed for user ''.
The exception message implies that the DBMigrator is not useing the SQL Connection but tries to create a new Connection from the Connectionstring.
This is my Connectionstring:
<add name="MasterDbContext" connectionString="Server=foo;Persist Security Info=True;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;" providerName="System.Data.SqlClient" />
The question is, are AccessToken supported in EF6.3 Migrations in conjunction with Azure Databases? Or is this an permission Issue on master database? Any workaround if AccessToken are a mandatory requirement?