Not able to enable Wi-Fi Calling

I've been trying to activate Wi-Fi Calling on a Note 4 for months now. Each time I've tried to activate the feature, I've gotten the error message below. Which really isn't all that helpful, as it doesn't explain the actual error or the reasons why.

Oops! That wasn't supposed to happen. Give us a minute and we'll get it fixed so you can try again.

I've called customer support and Tier 2 support numerous times, and get told there's no network issue present. I'll get a ticket created which gets closed via a text a few days later, with a message saying if I'm still having issues then call them. And thus the cycle repeats itself.

One thing that's always seemed screwy to me is when I try the activation, I get a message saying 'To enable this service you must confirm your emergency address'. When I saw someone else activate Wi-Fi Calling recently they got taken to a page where they could confirm their address, but mine just takes me straight into getting started on the activation.