Android Account Manager Problem

I'm looking at using Account Manager in the Android portion of a Xamarin Forms application with the following code:

var accMgr = AccountManager.Get(Forms.Context);
var account = new Account("username", "com.biz.app");
accMgr.AddAccountExplicitly(account, "password", null);

On the last line, an exception is being thrown:

java.lang.SecurityException: caller uid 10113 is different than the authenticator's uid

How can I go about resolving this?