Configuring Skype for Business delegates using UCMA - delegates

Question

I have been struggling to programatically add a delegate to a user (boss/admin scenario).
After running my test code in the boss sfb client the admin appears as a delegate however, in the admin's sfb client the boss does not appear under the section "people I manage calls for". I verified in the rtc frontend database that the delegation is configured, however the admin subscription record does not list the boss. Below is the code I used to achieve this.
Any ideas why the admin sfb client is not being notified of the new delegation?
Thanks,
Simon
1) add delegate-management
public void SendAddDelegate()
{
string body = string.Format($"<setDelegates xmlns=\"http://schemas.microsoft.com/2007/09/sip/delegate-management\" version=\"1\"><delegate uri=\"sip:admin#example.com\" action=\"add\"/></setDelegates>");
byte[] encBody = Encoding.UTF8.GetBytes(body);
RealTimeAddress rta = new RealTimeAddress("sip:boss#example.com");
System.Net.Mime.ContentType contentType = new System.Net.Mime.ContentType("application/msrtc-setdelegate+xml")
endpoint.InnerEndpoint.BeginSendMessage(MessageType.Service, rta, contentType, encBody, SendAddDelegateManagementMessageComplete, null);
}
private void SendAddDelegateManagementMessageComplete(IAsyncResult result)
{
try
{
SipResponseData srd = endpoint.InnerEndpoint.EndSendMessage(result);
logger.Debug($"srd.ResponseCode - {srd.ResponseCode}");
}
catch (Exception exc)
{
logger.Error("Exception SendMessageComplete with message - {0}", exc.Message);
}
}
2) Publish presence
public void PublishRoutingCategory(string delegateUri)
{
//routes not created here for sample brevity
routes.DelegateRingEnabled = true;
routes.Delegates.Add(delegateUri);
routes.SimultaneousRingEnabled = true;
routes.SimultaneousRing.Add(delegateUri);
routes.SkipPrimaryEnabled = true;
routes.ForwardAudioAppInvitesEnabled = true;
try
{
userEndpoint.LocalOwnerPresence.BeginPublishPresence(new PresenceCategory[] { routes }, PublishComplete, null);
}
catch (Exception exc)
{
logger.Error("Unknown error - {0}", exc.Message);
}
}
private void PublishComplete(IAsyncResult result)
{
try
{
endpoint.LocalOwnerPresence.EndPublishPresence(result);
}
catch (Exception exc)
{
logger.Error("Error Publish Complete- {0}", exc.Message);
}
}