Cannot enable VoLTE or WiFi Calling on iPhone Xs

I have been unable to enable VoLTE or WiFi Calling after switching to an iPhone Xs from an Android device.

Here are the steps I have tried so far with no luck:

1. Turn off phone for 5 Minutes
2. Updating Carrier Settings
3. Verifying I’m on the latest iOS
4. Verify Cellular settings. As per https://support.apple.com/en-us/HT203124 I only see the Options shown under “If your carrier doesn't support VoLTE”
5. Reset Network Settings
6. Verify APN settings to be “sp.koodo.com”
7. Enrolling through https://ent.telus.com/acmegw-android/koodo/entitlement/e911:
   It shows me the address I initially opened the account under, I’ve moved 3 times since
   I cannot update the address or get past this step without changing the address.
   Looking at the browser calls in the Developer Console I can see the backend throws an Error 500 with a Java Null Pointer Exception:

   java.lang.NullPointerException
   	com.telus.entitlement.service.DataStoreService.updateIMSE911PostalAddress(DataStoreService.java:699)
   	com.telus.entitlement.servlet.E911AddressAndroidServlet.handleSaveE911Address(E911AddressAndroidServlet.java:440)
   	com.telus.entitlement.servlet.E911AddressAndroidServlet.handleAjaxRequest(E911AddressAndroidServlet.java:259)
   	com.telus.entitlement.servlet.E911AddressAndroidServlet.doPost(E911AddressAndroidServlet.java:83)
   	javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
   	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
   	com.telus.entitlement.servlet.BaseServlet.service(BaseServlet.java:22)
   	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

    

8. Speak to a rep on a callback. He was unable to help me after 30 minutes of trying.

Anything else I can try? The device I am using is a Canadian iPhone Xs I bought from Bell. It is unlocked and my Koodo SIM works fine for LTE data and regular calling.